Esker and Upthrow

Esker noun - (geology) a long winding ridge of post glacial gravel and other sediment; deposited by meltwater from glaciers or ice sheets.

Upthrow and esker are semantically related. In some cases you can use "Upthrow" instead a noun "Esker".

Upthrow noun - Geology) a rise of land to a higher elevation (as in the process of mountain building.

Esker and upthrow are semantically related. Sometimes you can use "Esker" instead a noun "Upthrow".