fissile vs physics

fissile is not a noun while physics is a noun.

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

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

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