tidewater stream vs tidal stream

tidewater stream and tidal stream both are nouns.

Word	Noun	Adjective	Verb	Adverb
tidewater stream	Yes	No	No	No
tidal stream	Yes	No	No	No

As nouns, tidewater stream and tidal stream are synonyms defined as:

tidewater stream and tidal stream: a stream in which the effects of the tide extend far upstream

Other synonyms of tidewater stream include tidal river, tidewater river.

tidewater stream (noun)	tidal stream (noun)
a stream in which the effects of the tide extend far upstream	a stream in which the effects of the tide extend far upstream