speculator vs venturer

speculator and venturer both are nouns.

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

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

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

Other hypernyms of speculator include adventurer, gambler.

speculator (noun)	venturer (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	a merchant who undertakes a trading venture (especially a venture that sends goods overseas)