gastric antacid vs alkalizer

gastric antacid and alkalizer both are nouns.

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

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

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

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

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