Gopher

Smith’s Bible Dictionary · William Smith, F. N. Peloubet, M. A. Peloubet

(pitch) wood. Only once mentioned -- (Genesis 6:14) Two principal conjectures have been proposed --

That the "trees of gopher" are any trees of the resinous kind, such as pine, fir, etc.
That Gopher is cypress.

In other dictionaries

William Smith; revised by F. N. Peloubet and M. A. Peloubet; CrossWire SWORD module Smith 1.3

Bible Strong digital edition from CrossWire module 1.3, based on the 1884 Peloubet revision with later digital enrichments preserved