tau coefficient of correlation vs Kendall rank correlation

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

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

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

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

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

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