complex quantity vs imaginary

complex quantity and imaginary both are nouns.

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

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

complex quantity 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 quantity include complex number, imaginary number.

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