It occurs to me that metropolitan French has no word for "commuter" (please correct me if I'm wrong).
But Swiss French is able to (and does) borrow heavily from German. German helpfully has the word "Pendler", which has been borrowed into Swiss French as "pendulaire"(it already had the adjective "pendulaire" as in "train pendulaire").
The best the Collins-Robert can come up with is "banlieusard", which can also mean a suburban dweller who may or may not have a long commute to work. The dictionary gives the word "navetteur" but I've never heard this before, apart from in the form of "faire la navette".
