wash vs window-washing

wash and window-washing both are nouns.

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

As nouns, window-washing is a hyponym of wash; that is, window-washing is a word with a more specific, narrower meaning than wash:

Other hyponyms of wash include bathing, washup, ablution, dishwashing, washup, washing-up, rinse, soak, soaking, laundering.

wash (noun)	window-washing (noun)
any enterprise in which losses and gains cancel out	the activity of washing windows
the work of cleansing (usually with soap and water)
garments or white goods that can be cleaned by laundering
a watercolor made by applying a series of monochrome washes one over the other
a thin coat of water-base paint
the dry bed of an intermittent stream (as at the bottom of a canyon)
the flow of air that is driven backwards by an aircraft propeller
the erosive process of washing away soil or gravel by water (as from a roadway)

wash (verb)	window-washing (verb)
cleanse (one's body) with soap and water
to cleanse (itself or another animal) by licking
remove by the application of water or other liquid and soap or some other cleaning agent
make moist
wash or flow against
form by erosion
wash by removing particles
cleanse with a cleaning agent, such as soap, and water
separate dirt or gravel from (precious minerals)
clean with some chemical process
apply a thin coating of paint, metal, etc., to
move by or as if by water
be capable of being washed
admit to testing or proof