add vs ao, What's the Difference?

Which to use

“add” is a verb and “ao” is a noun - they look or sound alike but fill different roles in a sentence.

#840
“add” frequency rank: #17,538
“ao” frequency rank: 18378
confusion score

Side-by-Side Comparison

Feature	add	ao
Definition	To join or unite (e.g. one thing to another, or as several particulars) so as to increase the number, augment the quantity, or enlarge the magnitude, or so as to form into one aggregate.	grue ("blue or green", considered one color)

Letter map: add vs ao

Shared letters muted; letters that set add and ao apart highlighted. Shared run: 1.

3 ch

add

2 ch

Part-of-speech tell for add / ao

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: add is averb and aoanoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 18378, derived from the frequency rank of both members and their visual similarity.

add is recorded at frequency rank #840, classified as averb, pronounced /æd/. ao is at rank #17,538, tagged as anoun.

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 18378, this pair ranks #445,303 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of add vs ao

Shared letters: a. Private to "add": d. Private to "ao": o.

"add" · 3 letters · shape VCC · "ao" · 2 letters · shape VV

Frequently Asked Questions

Can "add" and "ao" be used interchangeably?

No - they are not even the same part of speech. "add" is a verb and "ao" a noun, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "add" or "ao"?

"add" is the more common of the two: it sits at frequency rank #840 in our English list, against #17,538 for "ao". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

Done with this confusable. These links stay specific to "add" and "ao".

Full dictionary entry for "add" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "ao" - compare definitions side by side with the headword page. Word entry
This pair ranks #445,303 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"add" and "ao" also get mixed up with nearby pairs, the highest-scored neighbour is "amb vs ao". Nearby pair

Confusion rank #445,303 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.