superlative vs least

superlative and least both are nouns.

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

superlative (noun)	least (noun)
an exaggerated expression (usually of praise)	something that is of no importance
the superlative form of an adjective or adverb
the highest level or degree attainable; the highest stage of development

superlative (adjective)	least (adjective)
highest in quality	the superlative of `little' that can be used with mass nouns and is usually preceded by `the'; a quantifier meaning smallest in amount or extent or degree

superlative (adverb)	least (adverb)
	used to form the superlative, smallest in size or degree