Is it permissible to derive (words/concepts) from the Names and Attributes (of Allah)?

The names and attributes of Allah are tawqifiyyah (restricted to divine revelation); they cannot be affirmed except with evidence, nor can names be derived from them except with evidence. Therefore, worshipping Allah with a name He did not name Himself, or His Messenger (peace be upon him) did not name Him, is a clear error. Not every attribute of Allah can have a name derived from it, such as "the Judge" (al-Qadi) from His saying, "And Allah judges with truth." As for finding a Shaykh in Egypt to learn Aqidah (creed), one should inquire about that in Egypt itself.