second-hand store vs shop

second-hand store and shop both are nouns.

Word	Noun	Adjective	Verb	Adverb
second-hand store	Yes	No	No	No
shop	Yes	No	Yes	No

As nouns, shop is a hypernym of second-hand store; that is, shop is a word with a broader meaning than second-hand store:

Other hypernyms of second-hand store include store.

second-hand store (noun)	shop (noun)
a shop that sells secondhand goods at reduced prices	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

second-hand store (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