ambuscade vs coup de main

ambuscade and coup de main both are nouns.

Word	Noun	Adjective	Verb	Adverb
ambuscade	Yes	No	Yes	No
coup de main	Yes	No	No	No

As nouns, coup de main is a hypernym of ambuscade; that is, coup de main is a word with a broader meaning than ambuscade:

ambuscade: the act of concealing yourself and lying in wait to attack by surprise
coup de main: an attack without warning

Other hypernyms of ambuscade include surprise attack.

ambuscade (noun)	coup de main (noun)
the act of concealing yourself and lying in wait to attack by surprise	an attack without warning

ambuscade (verb)	coup de main (verb)
wait in hiding to attack