recede vs ebb

recede is not a noun while ebb is a noun.

Word	Noun	Adjective	Verb	Adverb
recede	No	No	Yes	No
ebb	Yes	No	Yes	No

As verbs, ebb is a hyponym of recede; that is, ebb is a word with a more specific, narrower meaning than recede:

recede (noun)	ebb (noun)
	the outward flow of the tide
	a gradual decline (in size or strength or power or number)

recede (verb)	ebb (verb)
become faint or more distant	fall away or decline
retreat	hem in fish with stakes and nets so as to prevent them from going back into the sea with the ebb
pull back or move away or backward	flow back or recede