The Term ALLAH- Lexicography
Root word and derivatives: It may be helpful to examine different nuances and shades of meaning of the root word Alah:

ALAH : Adore, be very much afraid of, seek help or refuge with,
ALH: Grant shelter or security to
T’ALIH: Deify a being, make one a slave
I’LAAH : Help, rescue
ILAH : god , divinity , with the article ‘AL’
ALLAH : The One True God
ILAAHAT: Adoration, Passionate love
(Arabic-English Dictionary - F.Steingass)
ALLAH: The Proper Name applied to the Being Who exists necessarily by Himself, comprising all the (Most Beautiful Best) Attributes of Perfection. The word ALLAH has no corresponding word in English or in any language of the world. (Vocabulary y of Holy Quran). In `Tafsir-Kabir’ the derivation of the word has been traced as follows:
1. ALAH: e.g., ‘Alahtu Ilaa': which means `SAKANTU ILAA' -i.e Allah’s Name gives peace, tranquility, rest, satisfaction to the mind:

“Those who believe, and whose hearts find satisfaction in the remembrance of Allah, for without doubt,
In the remembrance of Allah, do hearts find satisfaction.” 13-28

2. ALAHUN: from ‘Walahun’ : Allah is One for Whom the creation has a natural passionate love, adoration, all intelligent thought gets perplexed at his wonders and perfection.
3. ILAAH: from ‘Laah’ which means High Exalted above every thing – time, space, matter, all imagination and intelligence.
4. ‘LAAH’: from ‘Yaluuhu Laa Huyan’ which means hidden – The One Who is hidden Himself from senses (manifest only through His creation)
5. From ‘Alhal Fasiil’ i.e., a child is totally dependent upon mother – The mankind is dependent for everything and all relief in difficulty upon Allah Only.
6. ALHA: from ‘Altun’: He is afraid of him .
“ALHA ALAA FULANUN”: He sought his protection

“ALHA ILAH” i.e Allah is the One Who provides protection in fear and sustains secure everything. (Tafsir Ibn Kathir, and "Sharah Asmaa-Ul Husnaa" by Kazi Muhammad Suleman)

Some scholars are of the view that it is derived from the root ‘Laah’, an ejaculation expressive of wonder or helplessness, whereas others trace it to the term ‘WALAH’ which bears the same significance. However according to some other scholars, it has no root and derivatives.

Allah: The Only God, A word which embraces all the Names by which the Mussalmaans designate the Deity. (John Penrice).

Any way the term Allah was applied as the proper Name for the Creator of all creation-worlds, Whom one can not fully comprehend and express except that he wonders and gets flabbergasted. In humility he surrenders to the Creator, Whose every Creation and Action are wondrously perplexing. It was never used in the sense of an attribute. Numerous attributes were termed separately. Furthermore, it was never used for any imaginary god or created idol.