Word: oldster
Part of speech: Noun
Syllables: old
ster
Definition: A midshipman of four years' standing; a master's mate.
Morphemes:
Affix: old
Language: en
PoS: Noun
Meaning: A person older than oneself, especially an adult in relation to a teenager.
Affix: -ster
Language: en
PoS: Suffix
Meaning: A diminutive appended to a person's name.