center bit vs centre bit

center bit and centre bit both are nouns.

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

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

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

center bit (noun)	centre 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