rain out vs wash out

rain out and wash out both are verbs.

Word	Noun	Adjective	Verb	Adverb
rain out	No	No	Yes	No
wash out	No	No	Yes	No

As verbs, rain out and wash out are synonyms defined as:

rain out (verb)	wash out (verb)
prevent or interrupt due to rain	deplete of strength or vitality
	lose color in the process of being washed
	drain off the color in the course of laundering
	remove by the application of water or other liquid and soap or some other cleaning agent
	wear or destroy by the force of water
	wash free from unwanted substances, such as dirt
	prevent or interrupt due to rain