whitecap vs moving ridge

whitecap and moving ridge both are nouns.

Word	Noun	Adjective	Verb	Adverb
whitecap	Yes	No	No	No
moving ridge	Yes	No	No	No

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

whitecap: a wave that is blown by the wind so its crest is broken and appears white
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 whitecap include wave.

whitecap (noun)	moving ridge (noun)
a wave that is blown by the wind so its crest is broken and appears white	one of a series of ridges that moves across the surface of a liquid (especially across a large body of water)