The particular style you use to express an idea in words is phraseology. Even if your two favorite novelists use the same basic plot, their phraseology will make the books feel completely different from each other.
You can think of phraseology as the way a speaker or writer puts words and phrases together to form sentences. A linguist who studies phraseology is interested in expressions and idioms and in the way that different word choices can change the meaning of a phrase. Phraseology was coined in the 1550s from the Greek phrasis, "way of speaking," and it originally meant "a phrase book."