1) Lexicographer 2) Lexicologist 
• (n.) One who investigates the derivation of words.
Et`y·mol'o·gist (ĕt`ĭ*mŏl'o*jĭst) noun [ Confer French étymologiste .] One who investigates the derivation of words. 
[n] - a lexicographer who specializes in etymology
etymologist 1. A lexicographer who specializes in etymology. 2. A specialist in etymology. Etymologists usually try to reconstruct information about languages that are too old for any direct information to be known; since so many have no written records for examination. By comparing words in related languages, one may learn about their shared par...
noun a lexicographer who specializes in etymology