square measure vs area unit

square measure and area unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
square measure	Yes	No	No	No
area unit	Yes	No	No	No

As nouns, square measure and area unit are synonyms defined as:

square measure (noun)	area unit (noun)
a system of units used to measure areas	a system of units used to measure areas