harmonic mean vs mean value

harmonic mean and mean value both are nouns.

Word	Noun	Adjective	Verb	Adverb
harmonic mean	Yes	No	No	No
mean value	Yes	No	No	No

As nouns, mean value is a hypernym of harmonic mean; that is, mean value is a word with a broader meaning than harmonic mean:

harmonic mean: the mean of n numbers expressed as the reciprocal of the arithmetic mean of the reciprocals of the numbers
mean value: an average of n numbers computed by adding some function of the numbers and dividing by some function of n

Other hypernyms of harmonic mean include mean.

harmonic mean (noun)	mean value (noun)
the mean of n numbers expressed as the reciprocal of the arithmetic mean of the reciprocals of the numbers	an average of n numbers computed by adding some function of the numbers and dividing by some function of n