scattering vs rain shower

scattering and rain shower both are nouns.

Word	Noun	Adjective	Verb	Adverb
scattering	Yes	No	No	No
rain shower	Yes	No	No	No

As nouns, rain shower is a hypernym of scattering; that is, rain shower is a word with a broader meaning than scattering:

scattering: a light shower that falls in some locations and not others nearby
rain shower: a brief period of precipitation

Other hypernyms of scattering include shower.

scattering (noun)	rain shower (noun)
the act of scattering	a brief period of precipitation
spreading widely or driving off
a light shower that falls in some locations and not others nearby
the physical process in which particles are deflected haphazardly as a result of collisions
a small number (of something) dispersed haphazardly