contrast material vs contrast medium

contrast material and contrast medium both are nouns.

Word	Noun	Adjective	Verb	Adverb
contrast material	Yes	No	No	No
contrast medium	Yes	No	No	No

As nouns, contrast material and contrast medium are synonyms defined as:

contrast material and contrast medium: a substance that is opaque to x-rays; when administered it allows a radiologist to examine the organ or tissue it fills

contrast material (noun)	contrast medium (noun)
a substance that is opaque to x-rays; when administered it allows a radiologist to examine the organ or tissue it fills	a substance that is opaque to x-rays; when administered it allows a radiologist to examine the organ or tissue it fills