stock trader vs bargainer

stock trader and bargainer both are nouns.

Word	Noun	Adjective	Verb	Adverb
stock trader	Yes	No	No	No
bargainer	Yes	No	No	No

As nouns, bargainer is a hypernym of stock trader; that is, bargainer is a word with a broader meaning than stock trader:

stock trader: someone who buys and sells stock shares
bargainer: someone who purchases and maintains an inventory of goods to be sold

Other hypernyms of stock trader include dealer, monger, trader.

stock trader (noun)	bargainer (noun)
someone who buys and sells stock shares	someone who purchases and maintains an inventory of goods to be sold
	negotiator of the terms of a transaction