superlative

adjective

1
the superlative form of an adjective or adverb
`fastest' is the superlative of the adjective `fast'
`least famous' is the superlative degree of the adjective `famous'
2
an exaggerated expression (usually of praise)
the critics lavished superlatives on it
3
the highest level or degree attainable; the highest stage of development
his landscapes were deemed the acme of beauty
the artist's gifts are at their acme

Also useful for “superlative”:Scrabble— High-value letters — see what it scores