Crestless wave and Moving ridge

Crestless wave noun - The undulating movement of the surface of the open sea.

Moving ridge and crestless wave are semantically related. In some cases you can use "Moving ridge" instead a noun phrase "Crestless wave".

Moving ridge noun - One of a series of ridges that moves across the surface of a liquid (especially across a large body of water).

Crestless wave and moving ridge are semantically related. Sometimes you can replace phrase "Crestless wave" with "Moving ridge", this phrases are similar.