phraseologist

[ frey-zee-ol-uh-jist ]
/ ˌfreɪ ziˈɒl ə dʒɪst /

noun

a person who treats of or is concerned with phraseology.
a person who affects a particular phraseology or is skilled in coining phrases.

Origin of phraseologist

First recorded in 1705–15; phraseolog(y) + -ist

British Dictionary definitions for phraseologist

phraseologist
/ (ˌfreɪzɪˈɒlədʒɪst) /

noun

a person who is interested in or collects phrases or who affects a particular phraseology