tidal stream vs tidewater stream

tidal stream and tidewater stream both are nouns.

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

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

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

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

tidal stream (noun)	tidewater 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