Kendall rank correlation vs tau coefficient of correlation

Kendall rank correlation and tau coefficient of correlation both are nouns.

Word	Noun	Adjective	Verb	Adverb
Kendall rank correlation	Yes	No	No	No
tau coefficient of correlation	Yes	No	No	No

As nouns, Kendall rank correlation and tau coefficient of correlation are synonyms defined as:

Kendall rank correlation and tau coefficient of correlation: a nonparametric measure of the agreement between two rankings

Other synonyms of Kendall rank correlation include Kendall's tau.

Kendall rank correlation (noun)	tau coefficient of correlation (noun)
a nonparametric measure of the agreement between two rankings	a nonparametric measure of the agreement between two rankings