ad-lib vs perform

ad-lib is a noun but perform is not a noun.

Word	Noun	Adjective	Verb	Adverb
ad-lib	Yes	Yes	Yes	No
perform	No	No	Yes	No

As verbs, perform is a hypernym of ad-lib; that is, perform is a word with a broader meaning than ad-lib:

Other hypernyms of ad-lib include do, execute.

ad-lib (noun)	perform (noun)
remark made spontaneously without prior preparation

ad-lib (adjective)	perform (adjective)
with little or no preparation or forethought
said or done without having been planned or written in advance

ad-lib (verb)	perform (verb)
perform without preparation	carry out or perform an action
	give a performance (of something)
	get (something) done
	perform a function