Mylanta vs alkaliser

Mylanta and alkaliser both are nouns.

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

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

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

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

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