Word: kingpin
Part of speech: Noun
Syllables: king
pin
Definition: The bolt holding together the truck of a roller skate or skateboard.
Morphemes:
Affix: king
Language: en
PoS: Verb
Meaning: To promote a piece of draughts/checkers that has traversed the board to the opposite side, that piece subsequently being permitted to move backwards as well as forwards.
Affix: pin
Language: en
PoS: Noun
Meaning: A short shaft, sometimes forming a bolt, a part of which serves as a journal.