complex quantity vs complex number

complex quantity and complex number both are nouns.

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

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

complex quantity 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 complex quantity include imaginary, imaginary number.

complex quantity (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