lurk vs ambush

lurk is not a noun while ambush is a noun.

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

As verbs, lurk and ambush are synonyms defined as:

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

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

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