fewest vs superlative

fewest is not a noun while superlative is a noun.

Word	Noun	Adjective	Verb	Adverb
fewest	No	Yes	No	No
superlative	Yes	Yes	No	No

fewest (noun)	superlative (noun)
	an exaggerated expression (usually of praise)
	the superlative form of an adjective or adverb
	the highest level or degree attainable; the highest stage of development

fewest (adjective)	superlative (adjective)
(superlative of `few' used with count nouns and usually preceded by `the') quantifier meaning the smallest in number	highest in quality