The term RELATIVE OF AN ENGLISH HORN can be solved with the 4 letter word OBOE. The OBOE is a double reed woodwind instrument that is related to the English horn, which is also a double reed woodwind instrument. The OBOE is a smaller version of the English horn and is used in orchestras, concert bands, and chamber music. It has a distinctive sound that is often used to create a haunting or melancholic atmosphere.