Wording
Phrasing, Diction
noun
You set aside these words specifically so you could get the wording right. Wording is important sometimes, like when you're trying to communicate something sensitive, or when you're writing a poem. Sometimes only certain words will do.
Note that 措辞 usually refers to the phrasing or diction of writing, not speech.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
君の詩の措辞が素晴らしいことに感動しました。
I was moved by how splendidly worded your poem was.