cubic centimetre vs cubic centimeter

cubic centimetre and cubic centimeter both are nouns.

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

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

cubic centimetre and cubic centimeter: a metric unit of volume equal to one thousandth of a liter

Other synonyms of cubic centimetre include cc, mil, milliliter, millilitre, ml.

cubic centimetre (noun)	cubic centimeter (noun)
a metric unit of volume equal to one thousandth of a liter	a metric unit of volume equal to one thousandth of a liter