tide vs ebbtide

tide and ebbtide both are nouns.

Word	Noun	Adjective	Verb	Adverb
tide	Yes	No	Yes	No
ebbtide	Yes	No	No	No

As nouns, ebbtide is a hyponym of tide; that is, ebbtide is a word with a more specific, narrower meaning than tide:

tide: the periodic rise and fall of the sea level under the gravitational pull of the moon
ebbtide: the tide while water is flowing out

tide (noun)	ebbtide (noun)
the periodic rise and fall of the sea level under the gravitational pull of the moon	the tide while water is flowing out
something that may increase or decrease (like the tides of the sea)
there are usually two high and two low tides each day