cookout vs barbeque

cookout and barbeque both are nouns.

Word	Noun	Adjective	Verb	Adverb
cookout	Yes	No	No	No
barbeque	Yes	No	Yes	No

As nouns, barbeque is a hyponym of cookout; that is, barbeque is a word with a more specific, narrower meaning than cookout:

cookout: an informal meal cooked and eaten outdoors
barbeque: a cookout in which food is cooked over an open fire; especially a whole animal carcass roasted on a spit

Other hyponyms of cookout include barbecue, clambake, fish fry, weenie roast, wiener roast, burgoo.

cookout (noun)	barbeque (noun)
an informal meal cooked and eaten outdoors	a rack to hold meat for cooking over hot charcoal usually out of doors
	a cookout in which food is cooked over an open fire; especially a whole animal carcass roasted on a spit
	meat that has been barbecued or grilled in a highly seasoned sauce

cookout (verb)	barbeque (verb)
	cook outdoors on a barbecue grill