sq ft vs square foot

sq ft and square foot both are nouns.

Word	Noun	Adjective	Verb	Adverb
sq ft	Yes	No	No	No
square foot	Yes	No	No	No

As nouns, sq ft and square foot are synonyms defined as:

sq ft and square foot: a unit of area equal to one foot by one foot square

sq ft (noun)	square foot (noun)
a unit of area equal to one foot by one foot square	a unit of area equal to one foot by one foot square