shop vs obtain

shop is a noun but obtain is not a noun.

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

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

shop (noun)	obtain (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)	obtain (verb)
give away information about somebody	receive a specified treatment (abstract)
do one's shopping	come into possession of
shop around; not necessarily buying	be valid, applicable, or true
do one's shopping at; do business with; be a customer or client of