ashcan vs trash bin

ashcan and trash bin both are nouns.

Word	Noun	Adjective	Verb	Adverb
ashcan	Yes	No	No	No
trash bin	Yes	No	No	No

As nouns, ashcan and trash bin are synonyms defined as:

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

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