work-clothes vs work clothes

work-clothes and work clothes both are nouns.

Word	Noun	Adjective	Verb	Adverb
work-clothes	Yes	No	No	No
work clothes	Yes	No	No	No

As nouns, work-clothes and work clothes are synonyms defined as:

Other synonyms of work-clothes include work-clothing, work clothing.

work-clothes (noun)	work clothes (noun)
clothing worn for doing manual labor	clothing worn for doing manual labor