square centimetre vs square centimeter

square centimetre and square centimeter both are nouns.

Word	Noun	Adjective	Verb	Adverb
square centimetre	Yes	No	No	No
square centimeter	Yes	No	No	No

As nouns, square centimetre and square centimeter are synonyms defined as:

square centimetre and square centimeter: a unit of area measurement equivalent to 1 centimeter in length multiplied by 1 centimeter in width, where one centimeter equals 0.3937 inch.

square centimetre (noun)	square centimeter (noun)
a unit of area measurement equivalent to 1 centimeter in length multiplied by 1 centimeter in width, where one centimeter equals 0.3937 inch.	a unit of area measurement equivalent to 1 centimeter in length multiplied by 1 centimeter in width, where one centimeter equals 0.3937 inch.