alkalizer vs gastric antacid

alkalizer and gastric antacid both are nouns.

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

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

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

Other synonyms of alkalizer include alkaliser, antacid, antiacid.

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