Words the Bible translates as mercy seat

English uses one word here. The Bible uses 2 words, and they do not mean the same thing. Each is listed with what it actually means, most frequent first.

hilastēriosἱλαστήριοςthe place where atonement is made: the gold cover over the ark where sacrificial blood was applied, and so the means by which sin is dealt with and fellowship with God restored
kapporetכַּפֹּרֶתthe gold cover over the ark: the slab of pure gold on top of the chest in the innermost room, where the LORD met Israel and where blood was applied to make things right

Keep looking

Every English meaning beginning with M is on its letter page, and the whole index starts at Browse.