Pepto-bismal vs alkaliser

Pepto-bismal and alkaliser both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pepto-bismal	Yes	No	No	No
alkaliser	Yes	No	No	No

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

Pepto-bismal: an antacid
alkaliser: an agent that counteracts or neutralizes acidity (especially in the stomach)

Other hypernyms of Pepto-bismal include alkalizer, antacid, antiacid, gastric antacid.

Pepto-bismal (noun)	alkaliser (noun)
an antacid	an agent that counteracts or neutralizes acidity (especially in the stomach)