imaginary number vs complex number

imaginary number and complex number both are nouns.

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

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

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

imaginary number (noun)	complex 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