shop at vs frequent

shop at is not an adjective while frequent is an adjective.

Word	Noun	Adjective	Verb	Adverb
shop at	No	No	Yes	No
frequent	No	Yes	Yes	No

As verbs, shop at and frequent are synonyms defined as:

shop at and frequent: do one's shopping at; do business with; be a customer or client of

Other synonyms of shop at include buy at, patronise, patronize, shop, sponsor.

shop at (adjective)	frequent (adjective)
	coming at short intervals or habitually
	frequently encountered

shop at (verb)	frequent (verb)
do one's shopping at; do business with; be a customer or client of	be a regular or frequent visitor to a certain place
	do one's shopping at; do business with; be a customer or client of