real number vs complex number

real number and complex number both are nouns.

Word	Noun	Adjective	Verb	Adverb
real number	Yes	No	No	No
complex number	Yes	No	No	No

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

real number: any rational or irrational number
complex number: (mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1

Other hypernyms of real number include complex quantity, imaginary, imaginary number.

real number (noun)	complex number (noun)
any rational or irrational number	(mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1