square fathom vs square measure

square fathom and square measure both are nouns.

Word	Noun	Adjective	Verb	Adverb
square fathom	Yes	No	No	No
square measure	Yes	No	No	No

As nouns, square measure is a hypernym of square fathom; that is, square measure is a word with a broader meaning than square fathom:

square fathom: a unit of area measurement equivalent to 1 fathom in length multiplied by 1 fathom in width; 1 fathom equals 6 feet.
square measure: a system of units used to measure areas

Other hypernyms of square fathom include area unit.

square fathom (noun)	square measure (noun)
a unit of area measurement equivalent to 1 fathom in length multiplied by 1 fathom in width; 1 fathom equals 6 feet.	a system of units used to measure areas