Trenches are long, narrow ditches dug into the ground for a variety of purposes. The term 'trenches' can refer to both military and non-military uses. PITS (4 letters) is a synonym for trenches, referring to a deep hole in the ground, usually with steep sides. RUTS (4 letters) is another synonym for trenches, referring to a groove or furrow made in the ground by the passage of a wheel or other object. Both terms are used to describe trenches, which are often used in warfare, construction, and agriculture.