speculative vs speculate

speculative is an adjective but speculate is not an adjective.

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

speculative (adjective)	speculate (adjective)
showing curiosity
not based on fact or investigation
not financially safe or secure

speculative (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