ravage = cause severe and extensive damage to.
rape =to force someone to have sex with you or to have sex with them against their will violently.
Dictionary.com gives a good explanation of when ravage and rape can be used interchangeably. as in when an invader or corporation ravages/plunders an environment community etc of its resources.
Rape is a word for sexual assault. This is one of the worst crimes there is. Rape can also mean to plunder or strip something of resources.
There are few words more powerful than rape, which is a horrifying crime. To rape someone is to force them to have sex with you. This word isn't an obscenity, but its meaning is. There are also some metaphorical meanings, like if a country is said to rape the land of a resource, like oil. Some countries might rape their rain forests by cutting them down. However it's used, rape is a violent and ugly word.