The Collaborative International Dictionary of English v.0.48:
Archaist \Ar"cha*ist\, n. 1. Am antiquary. [1913 Webster] 2. One who uses archaisms. [1913 Webster]WordNet (r) 3.0 (2006):
archaist n 1: a person who archaizes 2: an expert or collector of antiquities [syn: antiquary, antiquarian, archaist]