similarity vs approximation

approximation vs similarity

similarity and approximation both are nouns.

Word	Noun	Adjective	Verb	Adverb
similarity	Yes	No	No	No
approximation	Yes	No	No	No

As nouns, approximation is a hyponym of similarity; that is, approximation is a word with a more specific, narrower meaning than similarity:

similarity: the quality of being similar
approximation: the quality of coming near to identity (especially close in quantity)

Other hyponyms of similarity include homogeny, homology, homomorphism, homomorphy, isomorphism, isomorphy, alikeness, likeness, similitude, correspondence, parallelism, uniformity, uniformness, approach, sort, analog, analogue, parallel.

similarity (noun)	approximation (noun)
the quality of being similar	the act of bringing near or bringing together especially the cut edges of tissue
a Gestalt principle of organization holding that (other things being equal) parts of a stimulus field that are similar to each other tend to be perceived as belonging together as a unit	the quality of coming near to identity (especially close in quantity)
	an approximate calculation of quantity or degree or worth
	an imprecise or incomplete account

Difference between similarity and approximation

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