arcminute vs minute of arc

arcminute and minute of arc both are nouns.

Word	Noun	Adjective	Verb	Adverb
arcminute	Yes	No	No	No
minute of arc	Yes	No	No	No

As nouns, arcminute and minute of arc are synonyms defined as:

arcminute and minute of arc: a unit of angular distance equal to a 60th of a degree

Other synonyms of arcminute include minute.

arcminute (noun)	minute of arc (noun)
a unit of angular distance equal to a 60th of a degree	a unit of angular distance equal to a 60th of a degree