shop vs look for

shop is a noun but look for is not a noun.

Word	Noun	Adjective	Verb	Adverb
shop	Yes	No	Yes	No
look for	No	No	Yes	No

As verbs, look for is a hypernym of shop; that is, look for is a word with a broader meaning than shop:

Other hypernyms of shop include search, seek.

shop (noun)	look for (noun)
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

shop (verb)	look for (verb)
give away information about somebody	try to locate or discover, or try to establish the existence of
do one's shopping	be excited or anxious about
shop around; not necessarily buying
do one's shopping at; do business with; be a customer or client of