contrast medium vs contrast material

contrast medium and contrast material both are nouns.

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

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

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

contrast medium (noun)	contrast material (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