mitre vs mitre joint

mitre and mitre joint both are nouns.

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

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

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

Other synonyms of mitre include miter, miter joint.

mitre (noun)	mitre joint (noun)
a liturgical headdress worn by bishops on formal occasions	joint that forms a corner; usually both sides are bevelled at a 45-degree angle to form a 90-degree corner
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