inner product vs real number

inner product and real number both are nouns.

Word	Noun	Adjective	Verb	Adverb
inner product	Yes	No	No	No
real number	Yes	No	No	No

As nouns, real number is a hypernym of inner product; that is, real number is a word with a broader meaning than inner product:

Other hypernyms of inner product include real.

inner product (noun)	real number (noun)
a real number (a scalar) that is the product of two vectors	any rational or irrational number