complex number vs imaginary number

complex number and imaginary number both are nouns.

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

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

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

complex number (noun)	imaginary number (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