definitive vs authoritative

definitive and authoritative both are adjectives.

Word	Noun	Adjective	Verb	Adverb
definitive	No	Yes	No	No
authoritative	No	Yes	No	No

As adjectives, definitive and authoritative are synonyms defined as:

definitive (adjective)	authoritative (adjective)
supplying or being a final or conclusive settlement	endowed with authority
clearly defined or formulated	having authority or ascendancy or influence
of recognized authority or excellence	of recognized authority or excellence