What is the french word for rescue?

rescue comes from the French 'rescousse'- used now only in the phrase 'venir à la rescousse' (to come to the rescue). The most used term in French is secourir (verb for to rescue) or le secours, les secours (noun)

se porter au secours, aller au secours de quelqu'un = to rescue someone

appeler au secours = to call for help

une équipe de secours = a rescue team

les secours sont arrivés: the relief (team) arrived