Genesis 6:14 New English Translation

¹⁴Make^[a] for yourself an ark of cypress^[b] wood. Make rooms in the ark, and cover^[c] it with pitch inside and out.

Genesis 6:14 sn The Hebrew verb is an imperative. A motif of this section is that Noah did as the Lord commanded him—he was obedient. That obedience had to come from faith in the word of the Lord. So the theme of obedience to God’s word is prominent in this prologue to the law.
Genesis 6:14 tn A transliteration of the Hebrew term yields “gopher (גֹּפֶר, gofer) wood” (so KJV, NAB, NASB). While the exact nature of the wood involved is uncertain (cf. NLT “resinous wood”), many modern translations render the Hebrew term as “cypress” (so NEB, NIV, NRSV).
Genesis 6:14 tn The Hebrew term כָּפָר (kafar, “to cover, to smear” [= to caulk]) appears here in the Qal stem with its primary, nonmetaphorical meaning. The Piel form כִּפֶּר (kipper), which has the metaphorical meaning “to atone, to expiate, to pacify,” is used in Levitical texts (see HALOT 493-94 s.v. כפר). Some authorities regard the form in v. 14 as a homonym of the much more common Levitical term (see BDB 498 s.v. כָּפָר).

New English Translation (NET)