raven vs predate

raven is a noun but predate is not a noun.

Word	Noun	Adjective	Verb	Adverb
raven	Yes	No	Yes	No
predate	No	No	Yes	No

As verbs, raven and predate are synonyms defined as:

Other synonyms of raven include prey.

raven (noun)	predate (noun)
large black bird with a straight bill and long wedge-shaped tail

raven (verb)	predate (verb)
eat greedily	establish something as being earlier relative to something else
feed greedily	be earlier in time; go back further
prey on or hunt for	come before
obtain or seize by violence	prey on or hunt for