cook vs grill

cook and grill both are nouns.

Word	Noun	Adjective	Verb	Adverb
cook	Yes	No	Yes	No
grill	Yes	No	Yes	No

As verbs, grill is a hyponym of cook; that is, grill is a word with a more specific, narrower meaning than cook:

cook (noun)	grill (noun)
someone who cooks food	a framework of metal bars used as a partition or a grate
	a restaurant where food is cooked on a grill

cook (verb)	grill (verb)
transform and make suitable for consumption by heating	cook over or under a grill
transform by heating	examine thoroughly
prepare for eating by applying heat
prepare a hot meal
tamper, with the purpose of deception