Door sill and Doorstep

Doorstep and door sill are semantically related. In some cases you can use "Doorstep" instead a noun phrase "Door sill".

Doorstep noun - The sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway.

Door sill and doorstep are semantically related. Sometimes you can replace phrase "Door sill" with "Doorstep", this terms are similar.