spraying vs dispersal

spraying and dispersal both are nouns.

Word	Noun	Adjective	Verb	Adverb
spraying	Yes	No	No	No
dispersal	Yes	No	No	No

As nouns, dispersal is a hypernym of spraying; that is, dispersal is a word with a broader meaning than spraying:

spraying: the dispersion of fungicides or insecticides or fertilizer on growing crops (often from a low-flying aircraft)
dispersal: the act of dispersing or diffusing something

Other hypernyms of spraying include diffusion, dispersion, dissemination.

spraying (noun)	dispersal (noun)
the application of a liquid in the form of small particles ejected from a sprayer	the act of dispersing or diffusing something
the dispersion of fungicides or insecticides or fertilizer on growing crops (often from a low-flying aircraft)
a quantity of small objects flying through the air