imaging vs tomography

imaging and tomography both are nouns.

Word	Noun	Adjective	Verb	Adverb
imaging	Yes	No	No	No
tomography	Yes	No	No	No

As nouns, imaging and tomography are synonyms defined as:

imaging and tomography: (medicine) obtaining pictures of the interior of the body

imaging (noun)	tomography (noun)
(medicine) obtaining pictures of the interior of the body	(medicine) obtaining pictures of the interior of the body
the ability to form mental images of things or events