Counter

(school) grade; year; class

Suffix

class; grade; rank; level

Counter

kyu (junior rank in martial arts, go, shogi, etc.)

Adjectival nouns or quasi-adjectives (keiyodoshi)

high-class; high-grade; high-quality; high-end; luxury

high-ranking; high-level; senior

classmate

(social) class

rank; grade

upper level; upper grade; high rank; advanced level; senior level; upper class

lower grade; low class; junior (officer)

student in a higher grade; upperclassman

highest grade; top class

Nouns which may take the genitive case particle 'no'

highest grade; finest quality; top class

Grammar

superlative (degree)

intermediate level