* Noun: This is the most common usage. It refers to a breaking or bursting apart, like "The pipe suffered a rupture."
* Verb: It can also describe the act of breaking or bursting apart, like "The dam ruptured, releasing a flood."
* Adjective: Less common, but "ruptured" can describe something that is broken or torn, like "He had a ruptured appendix."
Let me know if you have a specific sentence in mind, and I can tell you the part of speech with certainty!