Concise Bible Dictionary:
Four Hebrew words are so translated.
1. kaphar, “to cover,” same as “to make atonement,” forgive (2 Chron. 30:18).
2. nasa, “to lift up,” forgive (Ex. 23:21; 1 Sam. 15:25; Job 7:21; Mic. 7:18).
3. salach, “to pass over,” forgive; used only of God’s forgiveness (Ex. 34:9; Num. 14:19-20; 2 Kings 5:18; 2 Kings 24:4; Neh. 9:17; Psa. 25:11; Isa. 55:7; Jer. 5:1,7; Jer. 33:8; Jer. 50:20; Lam. 3:42).
4. ratsah, “to delight in,” receive graciously, forgive (Isa. 40:2).