"a group of people who are chosen, usually by a larger group, to make decisions or to deal with a particular subject" http://www.oxfordlearnersdictionaries.com/definition/english/committee

it shows that the stress is different, so én is pronounced differently from en or allé is different from alle (and indeed in many cases helps you to understand that the meaning is different, too.) Many words of French origina in Norwegian have them. But use of them in writing in optional except for people's names and place names.