percussor vs plessor

percussor and plessor both are nouns.

Word	Noun	Adjective	Verb	Adverb
percussor	Yes	No	No	No
plessor	Yes	No	No	No

As nouns, percussor and plessor are synonyms defined as:

percussor and plessor: (medicine) a small hammer with a rubber head used in percussive examinations of the chest and in testing reflexes

Other synonyms of percussor include plexor.

percussor (noun)	plessor (noun)
(medicine) a small hammer with a rubber head used in percussive examinations of the chest and in testing reflexes	(medicine) a small hammer with a rubber head used in percussive examinations of the chest and in testing reflexes