square metre vs square meter

square metre and square meter both are nouns.

Word	Noun	Adjective	Verb	Adverb
square metre	Yes	No	No	No
square meter	Yes	No	No	No

As nouns, square metre and square meter are synonyms defined as:

square metre and square meter: a unit of measurement for area, defined as the area of a square with sides of exactly 1 metre; a centiare is 1/100th of an are

Other synonyms of square metre include centare.

square metre (noun)	square meter (noun)
a unit of measurement for area, defined as the area of a square with sides of exactly 1 metre; a centiare is 1/100th of an are	a unit of measurement for area, defined as the area of a square with sides of exactly 1 metre; a centiare is 1/100th of an are