tidal current vs eager

tidal current and eager both are nouns.

Word	Noun	Adjective	Verb	Adverb
tidal current	Yes	No	No	No
eager	Yes	Yes	No	No

As nouns, eager is a hyponym of tidal current; that is, eager is a word with a more specific, narrower meaning than tidal current:

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

Other hyponyms of tidal current include aegir, bore, eagre, tidal bore.

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

tidal current (adjective)	eager (adjective)
	having or showing keen interest or intense desire or impatient expectancy