centre bit vs center bit

centre bit and center bit both are nouns.

Word	Noun	Adjective	Verb	Adverb
centre bit	Yes	No	No	No
center bit	Yes	No	No	No

As nouns, centre bit and center bit are synonyms defined as:

centre bit and center bit: a bit with a sharp center point for guidance and two side cutters

centre bit (noun)	center bit (noun)
a bit with a sharp center point for guidance and two side cutters	a bit with a sharp center point for guidance and two side cutters