mitre joint vs miter joint

mitre joint and miter joint both are nouns.

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

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

mitre joint and miter 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 joint include miter, mitre.

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