Is tallest a common noun

Answer 1

No, the word 'taller' is an adjective, a word that describes a noun; the comparative form for the adjective tall (taller, tallest). Example sentence:

The taller sister is Megan; the tallest one is their brother Matt.

Answer 2

No tallest is an adjective; it is a superlative adjective.

Superlative adjective have -est ending.

biggest tallest nicest smallest prettiest

Answer 3

yes