GI hormones vs motilin

GI hormones and motilin both are nouns.

Word	Noun	Adjective	Verb	Adverb
GI hormones	Yes	No	No	No
motilin	Yes	No	No	No

As nouns, motilin is a hyponym of GI hormones; that is, motilin is a word with a more specific, narrower meaning than GI hormones:

GI hormones: hormones that affect gastrointestinal functioning
motilin: a gastrointestinal hormone that apparently participates in controlling smooth muscle contractions in the stomach and small intestine

Other hyponyms of GI hormones include gastrin, cholecystokinin, secretin, ghrelin.

GI hormones (noun)	motilin (noun)
hormones that affect gastrointestinal functioning	a gastrointestinal hormone that apparently participates in controlling smooth muscle contractions in the stomach and small intestine