gastric antacid vs antacid

gastric antacid and antacid both are nouns.

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

As nouns, gastric antacid and antacid are synonyms defined as:

gastric antacid and antacid: an agent that counteracts or neutralizes acidity (especially in the stomach)

Other synonyms of gastric antacid include alkaliser, alkalizer, antiacid.

gastric antacid (noun)	antacid (noun)
an agent that counteracts or neutralizes acidity (especially in the stomach)	an agent that counteracts or neutralizes acidity (especially in the stomach)

gastric antacid (adjective)	antacid (adjective)
	acting to neutralize acid (especially in the stomach)