Synonyms of tier

1 Syllable
class, queue, floor, rank, string, group, berm, line, row, train, trains, file, bank, floors, berms, sill, layer
2 Syllables
range, grade, league, rating, sections, downstairs, stratum, series, grouping, degree, course, order, story, section
3 Syllables
echelons, echelon
4 Syllables
categories, category, pigeonhole