segment, slice, class (of a society etc.)

group, company, class

class, grade

class, category, group; detachment (of soldiers 100-200), company, batallion

mosque; class (in school); organization, party (as in political party or orginazation), group; crowd, meeting

step, stair, stairs, steps; packet; stratification, stratum

layer, stratum, sheet, bed, row, fold

layer, coat (as in paint); stage; floor (of a building); stop, leg, lap, stopover

fold, pleat, wrinkle, layer, sheet, pin, pivot

crust, layer

coil, curve, layer, fold, row