window-washing vs washing

window-washing and washing both are nouns.

Word	Noun	Adjective	Verb	Adverb
window-washing	Yes	No	No	No
washing	Yes	No	No	No

As nouns, washing is a hypernym of window-washing; that is, washing is a word with a broader meaning than window-washing:

Other hypernyms of window-washing include lavation, wash.

window-washing (noun)	washing (noun)
the activity of washing windows	the work of cleansing (usually with soap and water)
	garments or white goods that can be cleaned by laundering