lie in wait vs ambuscade

lie in wait is not a noun while ambuscade is a noun.

Word	Noun	Adjective	Verb	Adverb
lie in wait	No	No	Yes	No
ambuscade	Yes	No	Yes	No

As verbs, lie in wait and ambuscade are synonyms defined as:

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

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

lie in wait (verb)	ambuscade (verb)
wait in hiding to attack	wait in hiding to attack