Allah is the most comprehensive and collective among the names of God, pointing at substance rather than the attributes. The different names of God that are mentioned in the HOLY QURÄN, each of them denotes a part of the attributes of God. The only name that refers to His Essence as well as His attributes, is Allah. Other names of God are often used as adjectives to qualify Allah; such as the Merciful Allah, the Forgiving Allah, the Almighty Allah, and etc.
Through the following verse of QURÄN, many such qualifications are attributed to Allah:
``He, is Allah besides whom there is no God. The Sovereign, the Holy, the Peaceable, the Secure, the Mighty, the Compeller, the Supreme. Glory be to Allah, above the partners that they attribute to HIM.''
QURÄN - S 59:23
A reason for comprehensiveness of Allah is that only through the phrase (LÄ ELAH ELL ALLAH = NO ALLAH BUT ALLAH) one can convert and become a Muslim.