aegir vs tidal flow

aegir and tidal flow both are nouns.

Word	Noun	Adjective	Verb	Adverb
aegir	Yes	No	No	No
tidal flow	Yes	No	No	No

As nouns, tidal flow is a hypernym of aegir; that is, tidal flow is a word with a broader meaning than aegir:

aegir: a high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary)
tidal flow: the water current caused by the tides

Other hypernyms of aegir include tidal current.

aegir (noun)	tidal flow (noun)
a high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary)	the water current caused by the tides