surmisal vs speculation

surmisal and speculation both are nouns.

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

As nouns, surmisal and speculation are synonyms defined as:

surmisal and speculation: a message expressing an opinion based on incomplete evidence

Other synonyms of surmisal include conjecture, guess, hypothesis, supposition, surmise.

surmisal (noun)	speculation (noun)
a message expressing an opinion based on incomplete evidence	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