head·pin 
(hĕdpĭn′)
(hĕdpĭn′)n.
Sports
Sports
The foremost pin in an arrangement of bowling pins. Also called kingpin.
- straightedged
- straighten
- straightener
- straighten out
- straight face
- straight-faced
- circumscriptive
- circumsolar
- circumspect
- circumspection
- circumspectly
- circumstance
- circumstantial
- circumstantial evidence
- circumstantiality
- circumstantially
- circumstantiate
- circumstantiation
- circumstellar
- circumterrestrial
- circumvallate
- circumvallation
- circumvent
- circumventer
- circumvention