speculator vs gambler

speculator and gambler both are nouns.

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

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

speculator: someone who risks losses for the possibility of considerable gains
gambler: a person who wagers money on the outcome of games or sporting events

Other hypernyms of speculator include adventurer, venturer.

speculator (noun)	gambler (noun)
someone who risks losses for the possibility of considerable gains	a person who wagers money on the outcome of games or sporting events
someone who makes conjectures without knowing the facts	someone who risks loss or injury in the hope of gain or excitement