imaginary vs imaginary part of a complex number

imaginary and imaginary part of a complex number both are nouns.

Word	Noun	Adjective	Verb	Adverb
imaginary	Yes	Yes	No	No
imaginary part of a complex number	Yes	No	No	No

imaginary (noun)	imaginary part of a 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	the part of a complex number that has the square root of -1 as a factor

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