Indian file, array, articulation, band, bank, bed, bedding, belt, buzz, category, catena, catenation, chain, chain reaction, chaining, concatenation, connection, consecution, continuum, couche, course, cycle, deck, descent, drone, echelon, endless belt, endless round, file, filiation, floor, gallery, gamut, gradation, grade, group, grouping, hum, layer, league, ledge, level, line, lineage, measures, monotone, nexus, order, overlayer, overstory, pendulum, periodicity, pigeonhole, plenum, powder train, progression, queue, range, rank, recurrence, reticulation, rotation, round, routine, row, run, scale, seam, sequence, series, shelf, single file, spectrum, stage, step, story, stratum, string, substratum, succession, superstratum, swath, thickness, thread, topsoil, train, underlayer, understory, understratum, windrow, zone