shlockmeister vs merchandiser

shlockmeister and merchandiser both are nouns.

Word	Noun	Adjective	Verb	Adverb
shlockmeister	Yes	No	No	No
merchandiser	Yes	No	No	No

As nouns, merchandiser is a hypernym of shlockmeister; that is, merchandiser is a word with a broader meaning than shlockmeister:

shlockmeister: (slang) a merchant who deals in shoddy or inferior merchandise
merchandiser: a businessperson engaged in retail trade

Other hypernyms of shlockmeister include merchant.

shlockmeister (noun)	merchandiser (noun)
(slang) a merchant who deals in shoddy or inferior merchandise	a businessperson engaged in retail trade