Correct spelling for the English word "Goost" is [ɡˈuːst], [ɡˈuːst], [ɡ_ˈuː_s_t] (IPA phonetic alphabet).
The word "goost" is an archaic form of the word "ghost". Its etymology can be traced back to the Old English word "gāst" or "gǣst", which meant "spirit" or "soul". This Old English term can be further traced to the Proto-Germanic word "*gaistaz". The word "goost" developed during the Middle English period and eventually evolved into the modern English word "ghost".