speculation vs surmisal

speculation and surmisal both are nouns.

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

As nouns, speculation and surmisal are synonyms defined as:

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

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

speculation (noun)	surmisal (noun)
a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence)	a message expressing an opinion based on incomplete 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