behave vs pretend

behave is not a noun while pretend is a noun.

Word	Noun	Adjective	Verb	Adverb
behave	No	No	Yes	No
pretend	Yes	Yes	Yes	No

behave (noun)	pretend (noun)
	the enactment of a pretense

behave (adjective)	pretend (adjective)
	imagined as in a play

behave (verb)	pretend (verb)
behave in a certain manner; show a certain behavior; conduct or comport oneself	make believe with the intent to deceive
behave well or properly	represent fictitiously, as in a play, or pretend to be or act like
	put forward, of a guess, in spite of possible refutation
	state insincerely
	behave unnaturally or affectedly
	put forward a claim and assert right or possession of