tidal current vs bore

tidal current and bore both are nouns.

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

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

tidal current: the water current caused by the tides
bore: 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, eager, eagre, tidal bore.

tidal current (noun)	bore (noun)
the water current caused by the tides	a hole or passage made by a drill; usually made for exploratory purposes
	diameter of a tube or gun barrel
	a high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary)
	a person who evokes boredom

tidal current (verb)	bore (verb)
	make a hole, especially with a pointed power or hand tool
	cause to be bored