Acclivity and Esker

Acclivity noun - An upward slope.

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

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

Acclivity and esker are semantically related in pile topic. Sometimes you can use "Acclivity" instead a noun "Esker", if it concerns topics such as small hill.