is a specific kind of: juvenile, juvenile person.

is a broader term that covers: bairn | buster | changeling | child prodigy, infant prodigy, wonder child | foster-child, foster child, fosterling | imp, monkey, rapscallion, rascal, scalawag, scallywag, scamp | kiddie, kiddy | orphan | peanut | picaninny, piccaninny, pickaninny | poster child | kindergartener, kindergartner, preschooler | silly | sprog | bambino, toddler, tot, yearling | urchin | street child, waif ... show more.

has as a part: child's body.

derivation: childhood, puerility | childhood | childlike, childly.