ranitidine vs antacid

ranitidine and antacid both are nouns.

Word	Noun	Adjective	Verb	Adverb
ranitidine	Yes	No	No	No
antacid	Yes	Yes	No	No

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

ranitidine: a histamine blocker and antacid (trade name Zantac) used to treat peptic ulcers and gastritis and esophageal reflux
antacid: an agent that counteracts or neutralizes acidity (especially in the stomach)

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

ranitidine (noun)	antacid (noun)
a histamine blocker and antacid (trade name Zantac) used to treat peptic ulcers and gastritis and esophageal reflux	an agent that counteracts or neutralizes acidity (especially in the stomach)

ranitidine (adjective)	antacid (adjective)
	acting to neutralize acid (especially in the stomach)