crestless wave vs moving ridge

crestless wave and moving ridge both are nouns.

Word	Noun	Adjective	Verb	Adverb
crestless wave	Yes	No	No	No
moving ridge	Yes	No	No	No

As nouns, moving ridge is a hypernym of crestless wave; that is, moving ridge is a word with a broader meaning than crestless wave:

crestless wave: the undulating movement of the surface of the open sea
moving ridge: one of a series of ridges that moves across the surface of a liquid (especially across a large body of water)

Other hypernyms of crestless wave include wave.

crestless wave (noun)	moving ridge (noun)
the undulating movement of the surface of the open sea	one of a series of ridges that moves across the surface of a liquid (especially across a large body of water)