Mylanta vs antiacid

Mylanta and antiacid both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mylanta	Yes	No	No	No
antiacid	Yes	No	No	No

As nouns, antiacid is a hypernym of Mylanta; that is, antiacid is a word with a broader meaning than Mylanta:

Mylanta: an antacid
antiacid: an agent that counteracts or neutralizes acidity (especially in the stomach)

Other hypernyms of Mylanta include alkaliser, alkalizer, antacid, gastric antacid.

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