head shop vs shop

head shop and shop both are nouns.

Word	Noun	Adjective	Verb	Adverb
head shop	Yes	No	No	No
shop	Yes	No	Yes	No

As nouns, shop is a hypernym of head shop; that is, shop is a word with a broader meaning than head shop:

Other hypernyms of head shop include store.

head shop (noun)	shop (noun)
a shop specializing in articles of interest to drug users	a course of instruction in a trade (as carpentry or electricity)
	a mercantile establishment for the retail sale of goods or services
	small workplace where handcrafts or manufacturing are done

head shop (verb)	shop (verb)
	give away information about somebody
	do one's shopping
	shop around; not necessarily buying
	do one's shopping at; do business with; be a customer or client of