percuss vs percussion

percuss is not a noun while percussion is a noun.

Word	Noun	Adjective	Verb	Adverb
percuss	No	No	Yes	No
percussion	Yes	No	No	No

percuss (noun)	percussion (noun)
	the act of exploding a percussion cap
	the act of playing a percussion instrument
	tapping a part of the body for diagnostic purposes
	the section of a band or orchestra that plays percussion instruments

percuss (verb)	percussion (verb)
strike or tap firmly