complex number vs imaginary

complex number and imaginary both are nouns.

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

As nouns, complex number and imaginary are synonyms defined as:

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

Other synonyms of complex number include complex quantity, imaginary number.

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

complex number (adjective)	imaginary (adjective)
	not based on fact; existing only in the imagination