Maalox vs gastric antacid

Maalox and gastric antacid both are nouns.

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

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

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

Other hypernyms of Maalox include alkaliser, alkalizer, antacid, antiacid.

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