flood tide vs rising tide

flood tide and rising tide both are nouns.

Word	Noun	Adjective	Verb	Adverb
flood tide	Yes	No	No	No
rising tide	Yes	No	No	No

As nouns, flood tide and rising tide are synonyms defined as:

flood tide and rising tide: the occurrence of incoming water (between a low tide and the following high tide)

Other synonyms of flood tide include flood.

flood tide (noun)	rising tide (noun)
the occurrence of incoming water (between a low tide and the following high tide)	the occurrence of incoming water (between a low tide and the following high tide)
the highest point of anything conceived of as growing or developing or unfolding