This is the 815th most frequent Italian word.
umano
"Umano" in English means "human."
Here, 'umano' is used as an adjective to describe a characteristic associated with humans (making errors).
L'errore è umano.
The error is human.
In this context, 'umano' modifies 'corpo' (body) to specify it pertains to humans.
La scienza studia il corpo umano.
Science studies the human body.
Here, 'umani' functions as a plural noun referring to humans as a species.