speculate vs speculation

speculate is not a noun while speculation is a noun.

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

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

speculate (verb)	speculation (verb)
reflect deeply on a subject
to believe especially on uncertain or tentative grounds
talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion
invest at a risk