Tums vs alkaliser

Tums and alkaliser both are nouns.

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

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

Tums: an antacid with active ingredient bismuth subsalicylate
alkaliser: an agent that counteracts or neutralizes acidity (especially in the stomach)

Other hypernyms of Tums include alkalizer, antacid, antiacid, gastric antacid.

Tums (noun)	alkaliser (noun)
an antacid with active ingredient bismuth subsalicylate	an agent that counteracts or neutralizes acidity (especially in the stomach)