dead reckoning vs guess

dead reckoning and guess both are nouns.

Word	Noun	Adjective	Verb	Adverb
dead reckoning	Yes	No	No	No
guess	Yes	No	Yes	No

As nouns, dead reckoning and guess are synonyms defined as:

Other synonyms of dead reckoning include guessing, guesswork, shot.

dead reckoning (noun)	guess (noun)
navigation without the aid of celestial observations	an estimate based on little or no information
an estimate based on little or no information	a message expressing an opinion based on incomplete evidence

dead reckoning (verb)	guess (verb)
	expect, believe, or suppose
	judge tentatively or form an estimate of (quantities or time)
	guess correctly; solve by guessing
	put forward, of a guess, in spite of possible refutation