murmuring vs whispering

murmuring and whispering both are nouns.

Word	Noun	Adjective	Verb	Adverb
murmuring	Yes	Yes	No	No
whispering	Yes	Yes	No	No

As adjectives, murmuring and whispering are synonyms defined as:

Other synonyms of murmuring include susurrant.

murmuring (noun)	whispering (noun)
a complaint uttered in a low and indistinct tone	speaking softly without vibration of the vocal cords
a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech	a light noise, like the noise of silk clothing or leaves blowing in the wind

murmuring (adjective)	whispering (adjective)
making a low continuous indistinct sound	making a low continuous indistinct sound