--- title: "BIP39 Words Starting with O — 55 Mnemonic Seed Phrase Words" url: "https://bip39-phrase.com/bip39-words/o/" language: "en" updated: "2026-10-19T00:00:00+00:00" --- # BIP39 Words Starting with O (55 words) The 55 BIP39 words that start with O run from #1215 [oak](/bip39-word/oak/) to #1269 [ozone](/bip39-word/ozone/) in the English wordlist: indexes 1214 to 1268, or **10010111110** to **10011110100** in binary. That is 2.7% of the 2048 words, the 17th-largest of the 25 letter groups. Word length goes from 3 letters ([oak](/bip39-word/oak/), [off](/bip39-word/off/) and 4 more) to 8 ([ordinary](/bip39-word/ordinary/) and [original](/bip39-word/original/)). Nine three-letter beginnings are shared by two or more words; the largest is **"out"**, with 4 words. The 21 words in these groups need their first four letters to be told apart, while 24 are identified by the first three, and 10 ([oak](/bip39-word/oak/), [odor](/bip39-word/odor/), [oil](/bip39-word/oil/) and 7 more) by the first two. The short words [off](/bip39-word/off/) and [own](/bip39-word/own/) also begin longer ones, so a four-letter backup keeps them whole. 13 of the 55 words have look-alikes one letter away, such as [once](/bip39-word/once/) and [one](/bip39-word/one/). Swapping two neighbouring letters turns [odor](/bip39-word/odor/) into [door](/bip39-word/door/). Read aloud, 43 pairs differ by a single sound, for example [oak](/bip39-word/oak/) and [okay](/bip39-word/okay/). Three spellings are shared with the [French BIP39 list](/french/), at different indexes: [opinion](/bip39-word/opinion/), [orange](/bip39-word/orange/) and [ozone](/bip39-word/ozone/). Five of the words appear in the official BIP39 test vectors, among them [office](/bip39-word/office/) and [open](/bip39-word/open/). ## All 55 BIP39 words starting with O | # | Word | Binary | IPA | Prefix | | ---- | --------------------------------- | ----------- | ----------- | ------ | | 1215 | [oak](/bip39-word/oak/) | 10010111110 | /əʊk/ | oak | | 1216 | [obey](/bip39-word/obey/) | 10010111111 | /əˈbeɪ/ | obey | | 1217 | [object](/bip39-word/object/) | 10011000000 | /ˈɒbʤɪkt/ | obje | | 1218 | [oblige](/bip39-word/oblige/) | 10011000001 | /əˈblaɪʤ/ | obli | | 1219 | [obscure](/bip39-word/obscure/) | 10011000010 | /əbˈskjʊə/ | obsc | | 1220 | [observe](/bip39-word/observe/) | 10011000011 | /əbˈzɜːv/ | obse | | 1221 | [obtain](/bip39-word/obtain/) | 10011000100 | /əbˈteɪn/ | obta | | 1222 | [obvious](/bip39-word/obvious/) | 10011000101 | /ˈɒbvɪəs/ | obvi | | 1223 | [occur](/bip39-word/occur/) | 10011000110 | /əˈkɜː/ | occu | | 1224 | [ocean](/bip39-word/ocean/) | 10011000111 | /ˈəʊʃən/ | ocea | | 1225 | [october](/bip39-word/october/) | 10011001000 | /ɒkˈtəʊbə/ | octo | | 1226 | [odor](/bip39-word/odor/) | 10011001001 | /ˈəʊdə/ | odor | | 1227 | [off](/bip39-word/off/) | 10011001010 | /ɒf/ | off | | 1228 | [offer](/bip39-word/offer/) | 10011001011 | /ˈɒfə/ | offe | | 1229 | [office](/bip39-word/office/) | 10011001100 | /ˈɒfɪs/ | offi | | 1230 | [often](/bip39-word/often/) | 10011001101 | /ˈɒfᵊn/ | ofte | | 1231 | [oil](/bip39-word/oil/) | 10011001110 | /ɔɪl/ | oil | | 1232 | [okay](/bip39-word/okay/) | 10011001111 | /ˈəʊˈkeɪ/ | okay | | 1233 | [old](/bip39-word/old/) | 10011010000 | /əʊld/ | old | | 1234 | [olive](/bip39-word/olive/) | 10011010001 | /ˈɒlɪv/ | oliv | | 1235 | [olympic](/bip39-word/olympic/) | 10011010010 | /əˈlɪmpɪk/ | olym | | 1236 | [omit](/bip39-word/omit/) | 10011010011 | /əˈmɪt/ | omit | | 1237 | [once](/bip39-word/once/) | 10011010100 | /wʌns/ | once | | 1238 | [one](/bip39-word/one/) | 10011010101 | /wʌn/ | one | | 1239 | [onion](/bip39-word/onion/) | 10011010110 | /ˈʌnjən/ | onio | | 1240 | [online](/bip39-word/online/) | 10011010111 | /ˈɒnˌlaɪn/ | onli | | 1241 | [only](/bip39-word/only/) | 10011011000 | /ˈəʊnli/ | only | | 1242 | [open](/bip39-word/open/) | 10011011001 | /ˈəʊpən/ | open | | 1243 | [opera](/bip39-word/opera/) | 10011011010 | /ˈɒpərə/ | oper | | 1244 | [opinion](/bip39-word/opinion/) | 10011011011 | /əˈpɪnjən/ | opin | | 1245 | [oppose](/bip39-word/oppose/) | 10011011100 | /əˈpəʊz/ | oppo | | 1246 | [option](/bip39-word/option/) | 10011011101 | /ˈɒpʃən/ | opti | | 1247 | [orange](/bip39-word/orange/) | 10011011110 | /ˈɒrɪnʤ/ | oran | | 1248 | [orbit](/bip39-word/orbit/) | 10011011111 | /ˈɔːbɪt/ | orbi | | 1249 | [orchard](/bip39-word/orchard/) | 10011100000 | /ˈɔːʧəd/ | orch | | 1250 | [order](/bip39-word/order/) | 10011100001 | /ˈɔːdə/ | orde | | 1251 | [ordinary](/bip39-word/ordinary/) | 10011100010 | /ˈɔːdnri/ | ordi | | 1252 | [organ](/bip39-word/organ/) | 10011100011 | /ˈɔːgən/ | orga | | 1253 | [orient](/bip39-word/orient/) | 10011100100 | /ˈɔːriənt/ | orie | | 1254 | [original](/bip39-word/original/) | 10011100101 | /əˈrɪʤənl/ | orig | | 1255 | [orphan](/bip39-word/orphan/) | 10011100110 | /ˈɔːfᵊn/ | orph | | 1256 | [ostrich](/bip39-word/ostrich/) | 10011100111 | /ˈɒstrɪʧ/ | ostr | | 1257 | [other](/bip39-word/other/) | 10011101000 | /ˈʌðə/ | othe | | 1258 | [outdoor](/bip39-word/outdoor/) | 10011101001 | /ˈaʊtdɔː/ | outd | | 1259 | [outer](/bip39-word/outer/) | 10011101010 | /ˈaʊtə/ | oute | | 1260 | [output](/bip39-word/output/) | 10011101011 | /ˈaʊtpʊt/ | outp | | 1261 | [outside](/bip39-word/outside/) | 10011101100 | /ˌaʊtˈsaɪd/ | outs | | 1262 | [oval](/bip39-word/oval/) | 10011101101 | /ˈəʊvᵊl/ | oval | | 1263 | [oven](/bip39-word/oven/) | 10011101110 | /ˈʌvn/ | oven | | 1264 | [over](/bip39-word/over/) | 10011101111 | /ˈəʊvə/ | over | | 1265 | [own](/bip39-word/own/) | 10011110000 | /əʊn/ | own | | 1266 | [owner](/bip39-word/owner/) | 10011110001 | /ˈəʊnə/ | owne | | 1267 | [oxygen](/bip39-word/oxygen/) | 10011110010 | /ˈɒksɪʤən/ | oxyg | | 1268 | [oyster](/bip39-word/oyster/) | 10011110011 | /ˈɔɪstə/ | oyst | | 1269 | [ozone](/bip39-word/ozone/) | 10011110100 | /ˈəʊzəʊn/ | ozon | ## Similar-looking words to check These 23 pairs differ by one letter or by two swapped neighbouring letters, with at least one word starting with O. Both words are valid, so a slip between them passes the word check and only the checksum can catch it. - [boil](/bip39-word/boil/) [oil](/bip39-word/oil/) - [bone](/bip39-word/bone/) [one](/bip39-word/one/) - [border](/bip39-word/border/) [order](/bip39-word/order/) - [coil](/bip39-word/coil/) [oil](/bip39-word/oil/) - [cover](/bip39-word/cover/) [over](/bip39-word/over/) - [foil](/bip39-word/foil/) [oil](/bip39-word/oil/) - [fold](/bip39-word/fold/) [old](/bip39-word/old/) - [gold](/bip39-word/gold/) [old](/bip39-word/old/) - [gown](/bip39-word/gown/) [own](/bip39-word/own/) - [hold](/bip39-word/hold/) [old](/bip39-word/old/) - [hover](/bip39-word/hover/) [over](/bip39-word/over/) - [live](/bip39-word/live/) [olive](/bip39-word/olive/) - [mother](/bip39-word/mother/) [other](/bip39-word/other/) - [once](/bip39-word/once/) [one](/bip39-word/one/) - [one](/bip39-word/one/) [tone](/bip39-word/tone/) - [one](/bip39-word/one/) [zone](/bip39-word/zone/) - [open](/bip39-word/open/) [oven](/bip39-word/oven/) - [open](/bip39-word/open/) [pen](/bip39-word/pen/) - [orange](/bip39-word/orange/) [range](/bip39-word/range/) - [oven](/bip39-word/oven/) [over](/bip39-word/over/) - [own](/bip39-word/own/) [town](/bip39-word/town/) - [ozone](/bip39-word/ozone/) [zone](/bip39-word/zone/) - [door](/bip39-word/door/) [odor](/bip39-word/odor/) (swapped letters) [ Full BIP39 Wordlist (all 2048 words) ](/#wordlist)