Usage patterns
言葉遣いが〈形容詞〉one's manner of speech is [adjective] (e.g. polite, rude)
She uses polite language.
言葉遣いに気をつけるto be careful about one's choice of words
Please be careful with your wording when speaking to someone above you.
言葉遣いを直すto correct someone's wording or manner of speaking
I was corrected on my wording by the teacher.