speculator vs adventurer

speculator and adventurer both are nouns.

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

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

speculator: someone who risks losses for the possibility of considerable gains
adventurer: a person who enjoys taking risks

Other hypernyms of speculator include venturer, gambler.

speculator (noun)	adventurer (noun)
someone who risks losses for the possibility of considerable gains	a person who enjoys taking risks
someone who makes conjectures without knowing the facts	someone who travels into little known regions (especially for some scientific purpose)