כַּפֹּרֶת (kappōret) is
a Hebrew noun
meaning propitiatory. It appears
27 times
in 4 books of the Hebrew Bible
(Strong's H3727).
Also rendered
mercy seat
Same Hebrew root (TWOT 1023c)
Root family 1023: כָפַרkāpar — I, make an atonement, make reconciliation, purge. (Denominative verb.) This root should probably be distinguished from kāpar II “to smear with pitch.”