learn vs audit

learn is not a noun while audit is a noun.

Word	Noun	Adjective	Verb	Adverb
learn	No	No	Yes	No
audit	Yes	No	Yes	No

As verbs, audit is a hyponym of learn; that is, audit is a word with a more specific, narrower meaning than learn:

Other hyponyms of learn include prepare, train, drill, exercise, practice, practise.

learn (noun)	audit (noun)
	a methodical examination or review of a condition or situation
	an inspection of the accounting procedures and records by a trained accountant or CPA

learn (verb)	audit (verb)
gain knowledge or skills	attend academic courses without getting credit
get to know or become aware of, usually accidentally	examine carefully for accuracy with the intent of verification
be a student of a certain subject
commit to memory; learn by heart
impart skills or knowledge to
find out, learn, or determine with certainty, usually by making an inquiry or other effort