flower store vs florist shop

flower store and florist shop both are nouns.

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

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

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

Other synonyms of flower store include florist.

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