tidewater stream vs tidal river

tidewater stream and tidal river both are nouns.

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

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

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

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

tidewater stream (noun)	tidal river (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