miter joint vs mitre

miter joint and mitre both are nouns.

Word	Noun	Adjective	Verb	Adverb
miter joint	Yes	No	No	No
mitre	Yes	No	No	No

As nouns, miter joint and mitre are synonyms defined as:

miter joint and mitre: joint that forms a corner; usually both sides are bevelled at a 45-degree angle to form a 90-degree corner

Other synonyms of miter joint include miter, mitre joint.

miter joint (noun)	mitre (noun)
joint that forms a corner; usually both sides are bevelled at a 45-degree angle to form a 90-degree corner	a liturgical headdress worn by bishops on formal occasions
	the surface of a beveled end of a piece where a miter joint is made
	joint that forms a corner; usually both sides are bevelled at a 45-degree angle to form a 90-degree corner