lying in wait vs coup de main

lying in wait and coup de main both are nouns.

Word	Noun	Adjective	Verb	Adverb
lying in wait	Yes	No	No	No
coup de main	Yes	No	No	No

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

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

Other hypernyms of lying in wait include surprise attack.

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