Noun and する verb
ことばづかい
誰かの言葉遣いを真似することは、外国語の良い勉強法です。
Imitating someone’s speech can be a good way to practice a foreign language.
If you try to consider (遣う) your words (言葉) you are making a choice of words.
The reading is 言葉 and 遣う combined together.