tea vs potable

tea and potable both are nouns.

Word	Noun	Adjective	Verb	Adverb
tea	Yes	No	No	No
potable	Yes	Yes	No	No

As nouns, potable is a hypernym of tea; that is, potable is a word with a broader meaning than tea:

Other hypernyms of tea include beverage, drink, drinkable.

tea (noun)	potable (noun)
a beverage made by steeping tea leaves in water	any liquid suitable for drinking
a light midafternoon meal of tea and sandwiches or cakes
dried leaves of the tea shrub; used to make tea
a tropical evergreen shrub or small tree extensively cultivated in e.g. China and Japan and India; source of tea leaves

tea (adjective)	potable (adjective)
	suitable for drinking