herald vs predecessor

herald and predecessor both are nouns.

Word	Noun	Adjective	Verb	Adverb
herald	Yes	No	Yes	No
predecessor	Yes	No	No	No

As nouns, herald and predecessor are synonyms defined as:

herald and predecessor: something that precedes and indicates the approach of something or someone

Other synonyms of herald include forerunner, harbinger, precursor.

herald (noun)	predecessor (noun)
something that precedes and indicates the approach of something or someone	something that precedes and indicates the approach of something or someone
(formal) a person who announces important news	one who precedes you in time (as in holding a position or office)

herald (verb)	predecessor (verb)
foreshadow or presage
praise vociferously
greet enthusiastically or joyfully