speculation vs speculate

speculation is a noun but speculate is not a noun.

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

speculation (noun)	speculate (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

speculation (verb)	speculate (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