援助【えんじょ】
assistance, aid, support
支援【しえん】
support, backing, aid, assistance
後援【こうえん】
support, backing
救援【きゅうえん】
relief, rescue
応援【おうえん】
aid, assistance, help, support, reinforcement, cheering, rooting (for), support
援護【えんご】
support, help, backing, covering (from enemy attack), protection
声援【せいえん】
(shout of) encouragement, cheering, rooting, support
援軍【えんぐん】
reinforcement