speculation vs gamble

speculation and gamble both are nouns.

Word	Noun	Adjective	Verb	Adverb
speculation	Yes	No	No	No
gamble	Yes	No	Yes	No

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

Other hyponyms of speculation include smart money, pyramid, agiotage.

speculation (noun)	gamble (noun)
a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence)	a risky act or venture
continuous and profound contemplation or musing on a subject or series of subjects of a deep or abstruse nature	money that is risked for possible monetary gain
a message expressing an opinion based on incomplete evidence
an investment that is very risky but could yield great profits

speculation (verb)	gamble (verb)
	play games for money
	take a risk in the hope of a favorable outcome