percussion vs rhythm section

percussion and rhythm section both are nouns.

Word	Noun	Adjective	Verb	Adverb
percussion	Yes	No	No	No
rhythm section	Yes	No	No	No

As nouns, percussion and rhythm section are synonyms defined as:

percussion and rhythm section: the section of a band or orchestra that plays percussion instruments

Other synonyms of percussion include percussion section.

percussion (noun)	rhythm section (noun)
the act of exploding a percussion cap	the section of a band or orchestra that plays percussion instruments
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