downfall vs virga

downfall and virga both are nouns.

Word	Noun	Adjective	Verb	Adverb
downfall	Yes	No	No	No
virga	Yes	No	No	No

As nouns, virga is a hyponym of downfall; that is, virga 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)
virga: light wispy precipitation that evaporates before it reaches the ground (especially when the lower air is low in humidity)

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

downfall (noun)	virga (noun)
a sudden decline in strength or number or importance	light wispy precipitation that evaporates before it reaches the ground (especially when the lower air is low in humidity)
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)