gastrin vs GI hormones

gastrin and GI hormones both are nouns.

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

As nouns, GI hormones is a hypernym of gastrin; that is, GI hormones is a word with a broader meaning than gastrin:

gastrin: polypeptide hormone secreted by the mucous lining of the stomach; when peptides and amino acids are present in the small intestine the secretion of gastric acid is stimulated
GI hormones: hormones that affect gastrointestinal functioning

Other hypernyms of gastrin include gastrointestinal hormone.

gastrin (noun)	GI hormones (noun)
polypeptide hormone secreted by the mucous lining of the stomach; when peptides and amino acids are present in the small intestine the secretion of gastric acid is stimulated	hormones that affect gastrointestinal functioning