Zantac vs gastric antacid

Zantac and gastric antacid both are nouns.

Word	Noun	Adjective	Verb	Adverb
Zantac	Yes	No	No	No
gastric antacid	Yes	No	No	No

As nouns, gastric antacid is a hypernym of Zantac; that is, gastric antacid is a word with a broader meaning than Zantac:

Zantac: a histamine blocker and antacid (trade name Zantac) used to treat peptic ulcers and gastritis and esophageal reflux
gastric antacid: an agent that counteracts or neutralizes acidity (especially in the stomach)

Other hypernyms of Zantac include histamine blocker, alkaliser, alkalizer, antacid, antiacid.

Zantac (noun)	gastric antacid (noun)
a histamine blocker and antacid (trade name Zantac) used to treat peptic ulcers and gastritis and esophageal reflux	an agent that counteracts or neutralizes acidity (especially in the stomach)