Ashcan and Ash-pan

Ashcan noun - A bin that holds rubbish until it is collected.

Ash-pan and ashcan are semantically related. In some cases you can replace phrase "Ash-pan" with "Ashcan", this terms are similar.

Ash-pan noun - A receptacle fitted beneath the grate in which ashes collect and are removed.

Ashcan and ash-pan are semantically related. You can use "Ashcan" instead a noun phrase "Ash-pan".