physics vs fissile

physics is a noun but fissile is not a noun.

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

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

physics (adjective)	fissile (adjective)
	capable of being split or cleft or divided in the direction of the grain
	capable of undergoing nuclear fission