pica vs eating disorder

pica and eating disorder both are nouns.

Word	Noun	Adjective	Verb	Adverb
pica	Yes	No	No	No
eating disorder	Yes	No	No	No

As nouns, eating disorder is a hypernym of pica; that is, eating disorder is a word with a broader meaning than pica:

pica: an eating disorder, frequent in children, in which non-nutritional objects are eaten persistently
eating disorder: a disorder of the normal eating routine

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