slop-seller vs trader

slop-seller and trader both are nouns.

Word	Noun	Adjective	Verb	Adverb
slop-seller	Yes	No	No	No
trader	Yes	No	No	No

As nouns, trader is a hypernym of slop-seller; that is, trader is a word with a broader meaning than slop-seller:

slop-seller: a dealer in cheap ready-made clothing
trader: someone who purchases and maintains an inventory of goods to be sold

Other hypernyms of slop-seller include bargainer, dealer, monger.

slop-seller (noun)	trader (noun)
a dealer in cheap ready-made clothing	someone who purchases and maintains an inventory of goods to be sold