rhythm section vs percussion

rhythm section and percussion both are nouns.

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

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

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

Other synonyms of rhythm section include percussion section.

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