'Youngster' definitions:

Definition of 'youngster'

From: WordNet
noun
A young person of either sex; "she writes books for children"; "they're just kids"; "`tiddler' is a British term for youngster" [syn: child, kid, youngster, minor, shaver, nipper, small fry, tiddler, tike, tyke, fry, nestling]

Definition of 'Youngster'

From: GCIDE
  • Youngster \Young"ster\, n. A young person; a youngling; a lad. [Colloq.] "He felt himself quite a youngster, with a long life before him." --G. Eliot. [1913 Webster]

Synonyms of 'youngster'

From: Moby Thesaurus