The word "gullion" is quite peculiar in terms of spelling. It is pronounced as /ˈɡʌljən/ and is derived from the Old French word "gouillon," referring to a small stream or watercourse. The spelling of the word is unique due to its two consecutive "l" letters, which are pronounced as a single sound /lj/. This sound is known as a consonant cluster, and it is a common feature in the English language. The word "gullion" is not commonly used in modern English, but it is still recognized as a valid word.