speculator vs scalper

speculator and scalper both are nouns.

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

As nouns, scalper is a hyponym of speculator; that is, scalper is a word with a more specific, narrower meaning than speculator:

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

Other hyponyms of speculator include hedger, operator, venture capitalist.

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