pica em vs pica

pica em and pica both are nouns.

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

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

Other synonyms of pica em include em.

pica em (noun)	pica (noun)
a linear unit (1/6 inch) used in printing	a linear unit (1/6 inch) used in printing
	an eating disorder, frequent in children, in which non-nutritional objects are eaten persistently