estimate vs estimation

estimate and estimation both are nouns.

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

As nouns, estimate and estimation are synonyms defined as:

estimate and estimation: a judgment of the qualities of something or somebody

As nouns, estimate and estimation are synonyms defined as:

estimate and estimation: an approximate calculation of quantity or degree or worth

Other synonyms of estimate include approximation, idea.

As nouns, estimate and estimation are synonyms defined as:

As nouns, estimate and estimation are synonyms defined as:

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

Other synonyms of estimate include appraisal.

estimate (noun)	estimation (noun)
a judgment of the qualities of something or somebody	a judgment of the qualities of something or somebody
an approximate calculation of quantity or degree or worth	an approximate calculation of quantity or degree or worth
the respect with which a person is held	the respect with which a person is held
a document appraising the value of something (as for insurance or taxation)	a document appraising the value of something (as for insurance or taxation)
a statement indicating the likely cost of some job

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