look for vs shop

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

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

As verbs, shop is a hyponym of look for; that is, shop is a word with a more specific, narrower meaning than look for:

look for (noun)	shop (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

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