murmurous vs rustling

murmurous is not a noun while rustling is a noun.

Word	Noun	Adjective	Verb	Adverb
murmurous	No	Yes	No	No
rustling	Yes	Yes	No	No

As adjectives, murmurous and rustling are synonyms defined as:

Other synonyms of murmurous include soughing, susurrous.

murmurous (noun)	rustling (noun)
	the stealing of cattle
	a light noise, like the noise of silk clothing or leaves blowing in the wind

murmurous (adjective)	rustling (adjective)
characterized by soft sounds	characterized by soft sounds