Or – theoretically – a noun during the genitive (مَجْرُور) situation which would develop a so called 'Idāfa (إِضافة). It could then express the meaning of Allah may be the Greatest of… Even so, some Muslim Students feel that "Allāh" should not be translated, because they understand the Arabic word https://allahumma-ameen04680.blogminds.com/5-essential-elements-for-hymn-thanks-to-god-17528430