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younker (n.) IPA Pronunciation:
1. young man
2. greenhorn, juvenile
How well resembles it the prime of youth,
Trimm’d like a younker prancing to his love!
– Henry VI, Part 3 (II.i)
The meaning seems to be a little derogatory. The literal meaning is #1, a young man but the implied meaning is often one who is inexperienced, foolish, immature.