washrag vs bath linen

washrag and bath linen both are nouns.

Word	Noun	Adjective	Verb	Adverb
washrag	Yes	No	No	No
bath linen	Yes	No	No	No

As nouns, bath linen is a hypernym of washrag; that is, bath linen is a word with a broader meaning than washrag:

washrag: bath linen consisting of a piece of cloth used to wash the face and body
bath linen: linens for use in the bathroom

washrag (noun)	bath linen (noun)
bath linen consisting of a piece of cloth used to wash the face and body	linens for use in the bathroom