bushwhack vs ambush

bushwhack is not a noun while ambush is a noun.

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

As verbs, bushwhack and ambush are synonyms defined as:

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

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

bushwhack (verb)	ambush (verb)
wait in hiding to attack	wait in hiding to attack
cut one's way through the woods or bush	hunt (quarry) by stalking and ambushing
live in the bush as a fugitive or as a guerilla