florist shop vs flower store

florist shop and flower store both are nouns.

Word	Noun	Adjective	Verb	Adverb
florist shop	Yes	No	No	No
flower store	Yes	No	No	No

As nouns, florist shop and flower store are synonyms defined as:

florist shop and flower store: a shop where flowers and ornamental plants are sold

Other synonyms of florist shop include florist.

florist shop (noun)	flower store (noun)
a shop where flowers and ornamental plants are sold	a shop where flowers and ornamental plants are sold