WordNet sense 1 (small workplace where handcrafts or manufacturing are done):

workshop

WordNet sense 2 (a mercantile establishment for the retail sale of goods or services):

store

WordNet sense 3 (do one's shopping at; do business with; be a customer or client of):

frequent, patronize, sponsor, patronise, frequent, buy at, shop at

WordNet sense 4 (shop around; not necessarily buying):

browse

WordNet sense 5 (a course of instruction in a trade (as carpentry or electricity)):

shop class

WordNet sense 6 (give away information about somebody):

betray, denounce, grass, rat, shit, snitch, stag, give away, tell on