ashcan vs dustbin

ashcan and dustbin both are nouns.

Word	Noun	Adjective	Verb	Adverb
ashcan	Yes	No	No	No
dustbin	Yes	No	No	No

As nouns, ashcan and dustbin are synonyms defined as:

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

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