ashcan vs ash-bin

ashcan and ash-bin both are nouns.

Word	Noun	Adjective	Verb	Adverb
ashcan	Yes	No	No	No
ash-bin	Yes	No	No	No

As nouns, ashcan and ash-bin are synonyms defined as:

Other synonyms of ashcan include ash bin, ashbin, dustbin, garbage can, trash barrel, trash bin, trash can, wastebin.

ashcan (noun)	ash-bin (noun)
a bin that holds rubbish until it is collected	a bin that holds rubbish until it is collected