shop vs retail store

shop and retail store both are nouns.

Word	Noun	Adjective	Verb	Adverb
shop	Yes	No	Yes	No
retail store	Yes	No	No	No

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

Other hypernyms of shop include mercantile establishment, outlet, sales outlet.

shop (noun)	retail store (noun)
a course of instruction in a trade (as carpentry or electricity)	a place of business for retailing goods
a mercantile establishment for the retail sale of goods or services
small workplace where handcrafts or manufacturing are done

shop (verb)	retail store (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