Succor is a slightly archaic but still-current word with biblical and humanitarian resonance. It implies urgency — the original Latin pictures someone running to help — and a sense of moral duty rather than mere transactional aid.
For UPSC writing it adds dignity to answers on disaster response, refugee assistance, and constitutional remedies. Note the American spelling ‘succor’ versus the British ‘succour’; Indian English allows either, but consistency matters in a single Mains script. The word is especially apt for GS2 questions on India’s HADR diplomacy and the Vasudhaiva Kutumbakam ethos.