phraseology

noun4

1. •
   The style in which words and phrases are used in writing or speech.
2. •
   A group of specialized words and expressions used by a particular group.

   • Railway grouping had caused some peculiarly Scottish phraseology to disappear, though the note "Stops on timous notice to the guard" survived until comparatively recently. — 1956
3. •
   Study of set or fixed expressions.
4. •
   A collection of phrases; a phrasebook.