כִּפֶּר (kāpar) is
a Hebrew verb
meaning cover over. It appears
103 times
in 16 books of the Hebrew Bible
(Strong's H3722).
Also rendered
and thou shalt pitch it with pitch
to atone
Same Hebrew root (TWOT 1024)
Root family 1024: כָפַרkāpar — II, cover over with pitch. This denominative verb is used only in Gen 6:14 in the waterproofing of the ark. The cognate word is used in the Babylonian flood story