cimetidine vs antiacid

cimetidine and antiacid both are nouns.

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

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

cimetidine: a drug (trade name Tagamet) used to treat peptic ulcers by decreasing the secretion of stomach acid
antiacid: an agent that counteracts or neutralizes acidity (especially in the stomach)

Other hypernyms of cimetidine include histamine blocker, alkaliser, alkalizer, antacid, gastric antacid.

cimetidine (noun)	antiacid (noun)
a drug (trade name Tagamet) used to treat peptic ulcers by decreasing the secretion of stomach acid	an agent that counteracts or neutralizes acidity (especially in the stomach)