A four letter word for Wednesday's god is Odin.
dieu
There is no Egyptian God that's name with the letter x.
idol
Well, if you mean the One True God, aka Jesus Christ then a 4 letter word is Lord.
Eros, the god of love.
Egyptian diety
Sobek, the Corcodile God of Egypt
Thor, Ullr and Loki are all four letter god names.
Bes- the Egyptian dwarf god and jester of the gods (:
DIKE
Abba- An intimate term for God as father. According to the OED. area