ashcan vs garbage can

ashcan and garbage can both are nouns.

Word	Noun	Adjective	Verb	Adverb
ashcan	Yes	No	No	No
garbage can	Yes	No	No	No

As nouns, ashcan and garbage can are synonyms defined as:

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

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