PYCNIC
PYCNIDIA
PYCNIDIAL
PYCNIDIOSPORE
PYCNIDIOSPORES
PYCNIDIUM
PYCNITE
PYCNITES
PYCNOCONIDIA
PYCNOCONIDIUM
PYCNODYSOSTOSES
PYCNODYSOSTOSIS
PYCNOGONID
PYCNOGONIDS
PYCNOGONOID
PYCNOMETER
PYCNOMETERS
PYCNOMETRIC
PYCNON
PYCNONS
PYCNOSES
PYCNOSIS
PYCNOSPORE
PYCNOSPORES
PYCNOSTYLE
PYCNOSTYLES
PYCNOTIC

27 words start with PYC.