scalper vs speculator

scalper and speculator both are nouns.

Word	Noun	Adjective	Verb	Adverb
scalper	Yes	No	No	No
speculator	Yes	No	No	No

As nouns, speculator is a hypernym of scalper; that is, speculator is a word with a broader meaning than scalper:

scalper: someone who buys something and resells it at a price far above the initial cost
speculator: someone who risks losses for the possibility of considerable gains

Other hypernyms of scalper include plunger.

scalper (noun)	speculator (noun)
someone who buys something and resells it at a price far above the initial cost	someone who risks losses for the possibility of considerable gains
	someone who makes conjectures without knowing the facts