not vs NP, What's the Difference?

Which to use

“not” is an adverb and “NP” is a noun - they look or sound alike but fill different roles in a sentence.

#23
“not” frequency rank: #13,570
“NP” frequency rank: 13593
confusion score

Side-by-Side Comparison

Feature	not	NP
Definition	Negates the meaning of the modified verb.	Initialism of notary public.

Letter map: not vs NP

Shared letters muted; letters that set not and NP apart highlighted. Shared run: 1.

3 ch

not

2 ch

Grammar separator: not vs NP

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: not is anadverb and NPanoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 13593, derived from the frequency rank of both members and their visual similarity.

not is recorded at frequency rank #23, classified as anadv, pronounced /nɒt/. NP is at rank #13,570, 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 13593, this pair ranks #474,875 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of not vs NP

Shared letters: n. Private to "not": ot. Private to "NP": p.

"not" · 3 letters · shape CVC · "NP" · 2 letters · shape CC

Frequently Asked Questions

Do "not" and "NP" mean the same thing in a sentence?

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

Which is more common, "not" or "NP"?

"not" is the more common of the two: it sits at frequency rank #23 in our English list, against #13,570 for "NP". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

You've compared "not" and "NP". Here's where to go from here.

Full dictionary entry for "not" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "NP" - compare definitions side by side with the headword page. Word entry
This pair ranks #474,875 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"not" and "NP" also get mixed up with nearby pairs, the highest-scored neighbour is "NP vs NPL". Nearby pair

Confusion rank #474,875 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.