tidal stream vs tidal river

tidal stream and tidal river both are nouns.

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

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

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

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

tidal 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