noun, noun which may take the genitive case particle 'no'
highest grade; top class; finest quality
Used for ranking, quality, or level; often appears in product descriptions, reviews, and formal evaluations.
This hotel provides top-class service.
He graduated with the highest grades.
superlative degree
Grammar term for the superlative form of adjectives and adverbs.
The superlative of an adjective expresses the highest degree in a comparison.
This hotel offers top-class service.
The superlative of 'good' is 'best'.
When using the superlative in English, you usually add 'the'.