slopshop vs slopseller's shop

slopshop and slopseller's shop both are nouns.

Word	Noun	Adjective	Verb	Adverb
slopshop	Yes	No	No	No
slopseller's shop	Yes	No	No	No

As nouns, slopshop and slopseller's shop are synonyms defined as:

slopshop and slopseller's shop: a store that sells cheap ready-made clothing

slopshop (noun)	slopseller's shop (noun)
a store that sells cheap ready-made clothing	a store that sells cheap ready-made clothing