backscatter vs natural philosophy

backscatter is not a noun while natural philosophy is a noun.

Word	Noun	Adjective	Verb	Adverb
backscatter	No	No	Yes	No
natural philosophy	Yes	No	No	No

backscatter (noun)	natural philosophy (noun)
	the science of matter and energy and their interactions

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