Agnipurana 365.43

365.43

vṛṣalā jadhanyajāḥ śūdrāścāṇḍālāntyāś caśaṅkarāḥ /
kāruḥ śilpī saṃhataistair dvayoḥ śreṇiḥ sajātibhiḥ //

Low-born people are *vṛṣala*s, *jaghanyaja*s, and *śūdra*s; outcastes are *caṇḍāla*s, *antya*s, and *saṅkara*s.
An artisan is *kāru* and *śilpin*; an association of such craftsmen of the same class is a *śreṇi* in two genders.