downfall vs fine spray

downfall and fine spray both are nouns.

Word	Noun	Adjective	Verb	Adverb
downfall	Yes	No	No	No
fine spray	Yes	No	No	No

As nouns, fine spray is a hyponym of downfall; that is, fine spray is a word with a more specific, narrower meaning than downfall:

downfall: the falling to earth of any form of water (rain or snow or hail or sleet or mist)
fine spray: precipitation in very small drops

Other hyponyms of downfall include hail, rain, rainfall, sleet, snow, snowfall, virga.

downfall (noun)	fine spray (noun)
a sudden decline in strength or number or importance	precipitation in very small drops
failure that results in a loss of position or reputation
the falling to earth of any form of water (rain or snow or hail or sleet or mist)