garbage can vs ashcan

garbage can and ashcan both are nouns.

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

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

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

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