tidal wave vs moving ridge

tidal wave and moving ridge both are nouns.

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

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

tidal wave: a wave resulting from the periodic flow of the tides that is caused by the gravitational attraction of the moon and sun
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 tidal wave include wave.

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

tidal wave: an unusual (and often destructive) rise of water along the seashore caused by a storm or a combination of wind and high tide
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 tidal wave include calamity, cataclysm, catastrophe, disaster, tragedy, wave.

tidal wave (noun)	moving ridge (noun)
a wave resulting from the periodic flow of the tides that is caused by the gravitational attraction of the moon and sun	one of a series of ridges that moves across the surface of a liquid (especially across a large body of water)
an unusual (and often destructive) rise of water along the seashore caused by a storm or a combination of wind and high tide
an overwhelming manifestation of some emotion or phenomenon