appraisal vs estimate

appraisal and estimate both are nouns.

Word	Noun	Adjective	Verb	Adverb
appraisal	Yes	No	No	No
estimate	Yes	No	Yes	No

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

appraisal: an expert estimation of the quality, quantity, and other characteristics of someone or something
estimate: a judgment of the qualities of something or somebody

Other hypernyms of appraisal include estimation.

As nouns, appraisal and estimate are synonyms defined as:

appraisal and estimate: a document appraising the value of something (as for insurance or taxation)

Other synonyms of appraisal include estimation.

appraisal (noun)	estimate (noun)
an expert estimation of the quality, quantity, and other characteristics of someone or something	a judgment of the qualities of something or somebody
the classification of someone or something with respect to its worth	an approximate calculation of quantity or degree or worth
a document appraising the value of something (as for insurance or taxation)	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

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