There is no such word as "intervent". You mean "intervene". And they are not quite the same: www.thefreedictionary.com This place will tell you what they mean.

Interfere means to go between to do something, to restrain, disrupt, disturb with a focus on the doing part, the action that is done, while intervene [ not intervent] means to come between to prevent, focusing on the motion part of coming between.

intervention has a positive conotatition while interfernce is a negative word. Eg. She is such a nosy parker always ineterfering in people's affairs. my sister intervned and i forgave my bother despite all his faults.