work-clothing vs work clothing

work-clothing and work clothing both are nouns.

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

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

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

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