Zantac vs alkaliser

Zantac and alkaliser both are nouns.

Word	Noun	Adjective	Verb	Adverb
Zantac	Yes	No	No	No
alkaliser	Yes	No	No	No

As nouns, alkaliser is a hypernym of Zantac; that is, alkaliser is a word with a broader meaning than Zantac:

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

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

Zantac (noun)	alkaliser (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)