bore

noun

1.
a person who evokes boredom
dullard
Derived from:
bore
2.
a high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary)
roust aegir eager eagre tidal bore
3.
diameter of a tube or gun barrel
caliber calibre gauge
Derived from:
bore
4.
a hole or passage made by a drill; usually made for exploratory purposes
bore-hole drill hole
Derived from:
bore