The term 'Variety of Guitar' can be summarized by the word 'Dobro', which is a five-letter word. Dobro is a type of guitar that was developed in the early 20th century by John Dopyera and his brother, Rudy. It is a resonator guitar that has a metal cone attached to the soundboard, which amplifies the sound of the strings. The Dobro is often used in bluegrass and country music, and is known for its distinctive twangy sound.