o'svsoiWhat's the difference?

Quick tell: o's is a noun, oi is an intj, so they fill different roles in a sentence.

Which to use

“o's” is a noun and “oi” is an intj - they look or sound alike but fill different roles in a sentence.

#30,902
“o's” frequency rank
#11,081
“oi” frequency rank
41983
confusion score

Side-by-Side Comparison

Feature o's oi
Definition plural of the letter o Said to get someone's attention; hey.

Where the eye mixes o's and oi

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

3 ch
o's
2 ch
oi

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: o's is /əʊz/ while oi is /ɔɪ/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (noun vs intj), which is usually the fastest check. Our composite confusion score for this pair is 41983, derived from the frequency rank of both members and their visual similarity.

o's is recorded at frequency rank #30,902, classified as anoun, pronounced /əʊz/. oi is at rank #11,081, tagged as anintj, pronounced /ɔɪ/.

Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.

With a confusion score of 41983, this pair ranks #253,347 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of o's vs oi

Shared letters: o. Private to "o's": s. Private to "oi": i.

"o's" · 2 letters · shape VC  ·  "oi" · 2 letters · shape VV

Frequently Asked Questions

Can "o's" and "oi" be used interchangeably?
No - they are not even the same part of speech. "o's" is a noun and "oi" an intj, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "o's" or "oi"?
"oi" is the more common of the two: it sits at frequency rank #11,081 in our English list, against #30,902 for "o's". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list