washing vs garment

washing and garment both are nouns.

Word	Noun	Adjective	Verb	Adverb
washing	Yes	No	No	No
garment	Yes	No	Yes	No

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

Other hypernyms of washing include household linen, white goods.

washing (noun)	garment (noun)
the work of cleansing (usually with soap and water)	an article of clothing
garments or white goods that can be cleaned by laundering

washing (verb)	garment (verb)
	provide with clothes or put clothes on