Guerrilla warfare and Trench warfare

Trench warfare and guerrilla warfare are semantically related In some cases you can replace phrase "Trench warfare" with "Guerrilla warfare", this phrases are similar.

Trench warfare noun - A type of armed combat in which the opposing troops fight from trenches that face each other.

Guerrilla warfare and trench warfare are semantically related in form of warfare with established lines topic. You can use "Guerrilla warfare" instead a noun phrase "Trench warfare".