Correct spelling, explanation: pharaoh is a word of a complicated origin. Primarily it came from Ancient Egypt, in Europe, it is mostly originated from Hebrew phārʿōh, but it appeared in English directly from Latin pharaō. If it is used as a compound name, it should be written with a capital letter. If it acts as a common noun, it is lowercased. In version pharoah there is a misspelling and the end of the word. The only correct spelling is pharaoh.

Definition of pharaoh:
noun: a title of a king in Ancient Egypt
The most recognizable Egyptian sovereign is Pharaoh Ramesses II.
One of the showpieces is the mummy of an Egyptian pharaoh, which are very well preserved.

Incorrect spelling, explanation: pharoah is the incorrect version of pharaoh. The word may be used as a part of a compound name, then it needs to be written with a capital letter, although it may also function as a noun and be lowercased. Pharaoh came to English from Latin pharaō, but the word has a more complex origin. It comes from Ancient Egypt but appeared in Europe from Hebrew phārʿōh. Based on these ancestors’ examples, we got the current spelling, pharaoh.