phraseologist
/ˌfreɪzɪˈɒlədʒɪst/noun
1A maker or user of phrases, especially one who uses phrases in an indiscriminate, trite, or grandiose manner; a phrasemonger.
2A writer on or expert in phraseology.
Origin
Early 18th century; earliest use found in George Berkeley (1685–1753), Church of Ireland bishop of Cloyne and philosopher. From phraseology + -ist; compare -logist.