"Sackage" is a relatively uncommon word, referring to the act of plundering or looting. However, there are various synonyms that can be used in its place. For example, words like pillage, raid, ransack, and sack are commonly used to describe the act of plundering. Other synonyms for "sackage" can include theft, burglary, invasion, and occupation. Each of these words carries a slightly different connotation and may be appropriate in different situations. However, all of them describe an act of taking something by force or without permission, making them fitting replacements for the word "sackage".