luokka (englanniksi)

category (s: kategoria)
class (s: kategoria / laatuaste / tieteellinen luokittelu / koulun luokka-aste / BrE / group, collection, category or set sharing characteristics or attributes / / category of seats in an airplane, train or other means of mass transportation / / group of students in a regularly scheduled meeting with a teacher / mathematics / collection of sets definable by a shared property / taxonomy)
grade (s: laatuaste / koulun luokka-aste / AmE / North America: a level of pre-collegiate education)
social class (s: social grouping, based on job, wealth, inheritance etc.)
school class (s: group of pre-college students who regularly attend lectures together)
classroom (s)