shopper vs client

shopper and client both are nouns.

Word	Noun	Adjective	Verb	Adverb
shopper	Yes	No	No	No
client	Yes	No	No	No

As nouns, client is a hypernym of shopper; that is, client is a word with a broader meaning than shopper:

Other hypernyms of shopper include customer.

shopper (noun)	client (noun)
someone who visits stores in search of articles to buy	(computer science) any computer that is hooked up to a computer network
a commercial agent who shops at the competitor's store in order to compare their prices and merchandise with those of the store that employs her	a person who seeks the advice of a lawyer
	someone who pays for goods or services