A classification
category, division, group, kind, sort, degree, order, rank, grade, standing, level, genus, distinction, breed, type, kingdom, subdivision, phylum, subphylum, subclass, superorder, family, cast, mold, sect, quality, rate, collection, denomination, department, species, variety, branch, genre, range, brand, set, estate, hierarchy, section, domain, nature, suit, color, origin, character, humor, frame, temperament, school, designation, temper, sphere, brood, spirit, vein, persuasion, head, province, league, make, grain, feather, source, name, mood, habit, form, selection, stamp, stripe, status, range, streak, property, aspect, disposition, tone; see also classification 1, state 2.
A division of society
caste, social rank, social stratum, stratum, status, station, socioeconomic level, cultural level, family, breed, sect, layer of society, standing, place, sphere, circle, stock, clan, nobility, high rank, pedigree, society, prestige, income bracket, income group, title, degree, position, connection, precedence, genealogy, power, company, derivation, source, descent, birth, ancestry, influence, hierarchy, state, lineage, condition, strain, tribe, moiety, estate, extraction, origin; see also sense 1, rank 3, tribe.
A group organized for study
course, section, subject, grade, level, year, form, lecture, recitation, seminar, colloquium, discussion group, round table, meeting for study, period, lesson, assembly, group, session, room, division, course of study.
*High quality
elegance, refinement, distinction, panache; see elegance 1.