whispering vs speaking

whispering and speaking both are nouns.

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

As nouns, speaking is a hypernym of whispering; that is, speaking is a word with a broader meaning than whispering:

Other hypernyms of whispering include speech production.

whispering (noun)	speaking (noun)
speaking softly without vibration of the vocal cords	delivering an address to a public audience
a light noise, like the noise of silk clothing or leaves blowing in the wind	the utterance of intelligible speech

whispering (adjective)	speaking (adjective)
making a low continuous indistinct sound	capable of or involving speech or speaking
	capable of speech