WordNet sense 1 (a characteristic property that defines the apparent individual nature of something):

character, lineament

WordNet sense 2 ((music) the distinctive property of a complex sound (a voice or noise or musical sound)):

timber, timbre, tone

WordNet sense 3 (a degree or grade of excellence or worth):

caliber, calibre

WordNet sense 4 (of superior grade):

choice, prime, prize, select

WordNet sense 5 (of high or superior quality or performance):

superior

WordNet sense 6 (occupying the highest socioeconomic position in a society):

upper-class