When it comes to finding synonyms for the word "entrenchments", there are several options to consider. One possible word is "fortifications", which denotes structures built to defend against an attack. Another option is "defenses", which refers to any mechanism or strategy used to repel an enemy. "Trenches" is also a word that is often associated with the idea of entrenchments, as it represents a long, narrow excavation made in the ground as a defensive measure. Other possible synonyms include "redoubts", "ramparts", and "strongholds", all of which convey the idea of fortified positions designed to withstand an assault.