xylophone vs marimba

xylophone and marimba both are nouns.

Word	Noun	Adjective	Verb	Adverb
xylophone	Yes	No	No	No
marimba	Yes	No	No	No

As nouns, xylophone and marimba are synonyms defined as:

xylophone and marimba: a percussion instrument with wooden bars tuned to produce a chromatic scale and with resonators; played with small mallets

xylophone (noun)	marimba (noun)
a percussion instrument with wooden bars tuned to produce a chromatic scale and with resonators; played with small mallets	a percussion instrument with wooden bars tuned to produce a chromatic scale and with resonators; played with small mallets