キュウ

級, 糸, 及, 丿, 又

class, rank, grade

高級(こうきゅう): high class; high grade
階級(かいきゅう): (social) class; rank; grade
上級(じょうきゅう): advanced level; high grade; senior
初級(しょきゅう): elementary level
級(きゅう): class, grade, rank; school class, grade
学級(がっきゅう): (school) class
同級(どうきゅう): the same grade; same class
等級(とうきゅう): (1) grade; class (2) (astronomical) magnitude