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