dead reckoning vs estimate

dead reckoning and estimate both are nouns.

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

As nouns, estimate is a hypernym of dead reckoning; that is, estimate is a word with a broader meaning than dead reckoning:

Other hypernyms of dead reckoning include approximation, estimation, idea.

dead reckoning (noun)	estimate (noun)
navigation without the aid of celestial observations	a judgment of the qualities of something or somebody
an estimate based on little or no information	an approximate calculation of quantity or degree or worth
	the respect with which a person is held
	a document appraising the value of something (as for insurance or taxation)
	a statement indicating the likely cost of some job

dead reckoning (verb)	estimate (verb)
	judge tentatively or form an estimate of (quantities or time)
	judge to be probable