caliber vs bore

caliber and bore both are nouns.

Word	Noun	Adjective	Verb	Adverb
caliber	Yes	No	No	No
bore	Yes	No	Yes	No

As nouns, caliber and bore are synonyms defined as:

Other synonyms of caliber include calibre, gauge.

caliber (noun)	bore (noun)
a degree or grade of excellence or worth	a hole or passage made by a drill; usually made for exploratory purposes
diameter of a tube or gun barrel	diameter of a tube or gun barrel
	a high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary)
	a person who evokes boredom

caliber (verb)	bore (verb)
	make a hole, especially with a pointed power or hand tool
	cause to be bored