1)Authentic:- Known to be True, of undisputed origin and not a copy. Example:- (a) Is it an authentic document ? (b) What he has said is an authentic statement ? 2)Geniune:-truly what something is said to be, not fake or artificial, Example:- (a) She looked at me in genuine astonishment. (b) It is a genuine pearl. (C) We sell only genuine spare-parts for these imported cars.