ambush vs lurk

ambush is a noun but lurk is not a noun.

Word	Noun	Adjective	Verb	Adverb
ambush	Yes	No	Yes	No
lurk	No	No	Yes	No

As verbs, ambush and lurk are synonyms defined as:

Other synonyms of ambush include ambuscade, bushwhack, lie in wait, scupper, waylay.

ambush (noun)	lurk (noun)
the act of concealing yourself and lying in wait to attack by surprise

ambush (verb)	lurk (verb)
wait in hiding to attack	wait in hiding to attack
hunt (quarry) by stalking and ambushing	to monitor a web forum or similar without making your presence pubilc
	be about a place without any apparent purpose
	lie in wait, lie in ambush, behave in a sneaky and secretive manner