stationer vs stationery seller

stationer and stationery seller both are nouns.

Word	Noun	Adjective	Verb	Adverb
stationer	Yes	No	No	No
stationery seller	Yes	No	No	No

As nouns, stationer and stationery seller are synonyms defined as:

stationer and stationery seller: a merchant who sells writing materials and office supplies

stationer (noun)	stationery seller (noun)
a merchant who sells writing materials and office supplies	a merchant who sells writing materials and office supplies