em quad vs em

em quad and em both are nouns.

Word	Noun	Adjective	Verb	Adverb
em quad	Yes	No	No	No
em	Yes	No	No	No

As nouns, em quad and em are synonyms defined as:

Other synonyms of em quad include mutton quad.

em quad (noun)	em (noun)
a quad with a square body	a quad with a square body
	a linear unit (1/6 inch) used in printing