rip current vs riptide

rip current and riptide both are nouns.

Word	Noun	Adjective	Verb	Adverb
rip current	Yes	No	No	No
riptide	Yes	No	No	No

As nouns, rip current and riptide are synonyms defined as:

rip current and riptide: a strong surface current flowing outwards from a shore

rip current (noun)	riptide (noun)
a strong surface current flowing outwards from a shore	a strong surface current flowing outwards from a shore
	a stretch of turbulent water in a river or the sea caused by one current flowing into or across another current