Gatecrash is a term defined as attending a party or an event without being invited. However, there are other words that can also be used as synonyms for this term. Words like crash, barge in, storm, trespass, intrude, and invade can replace the term gatecrash. Crash generally means to enter with force while barge in is more casual. Storm is an aggressive term used for forcefully entering, while trespass is used when someone crosses a line without permission. On the other hand, intrude is more polite and used when someone enters a space they weren't invited to, and invade is used when someone forcefully enters a country or region.