A Search about the quality of the holy Quran as a Divine Miracle

Most of the Scholars and commentators of Quran have discussed abaot it as being a miracle and divine sign. Some of them have considered its literary and eloquence aspects, While some others have stressed on the meaning and spiritual considerations.A question about the miraclous eloquence of Quran is that why the word "miracle" is not used in the Quranic chapters? And wether or not we can use the word "miracle " as a Synonym for the words "Sign ", " Verse "? Another question arises when we come to know that there is no reference made in Quran and the narrations of the infallible leaders of Islam (p.b.u.h) to the literary and eloquence of the holy Book; while they have used some adjectives like Lead, Guide, Light, Sign, Reason, Wisdom, and Dominant. It is concluded that the meaning and Spiritual miraculous aspecte of the holy Quran, are more important than its, literary and eloquence characteristics, and some of the Shia scholars have paid due attention to those qualities.