physics vs backscatter

physics is a noun but backscatter is not a noun.

Word	Noun	Adjective	Verb	Adverb
physics	Yes	No	No	No
backscatter	No	No	Yes	No

physics (noun)	backscatter (noun)
the science of matter and energy and their interactions
the physical properties, phenomena, and laws of something

physics (verb)	backscatter (verb)
	scatter (radiation) by the atoms of the medium through which it passes