CYPERACEOUS
CYPHER
CYPHERED
CYPHERING
CYPHERS
CYPRES
CYPRESES
CYPRESS
CYPRESSES
CYPRIAN
CYPRIANS
CYPRID
CYPRIDES
CYPRIDS
CYPRINE
CYPRINID
CYPRINIDS
CYPRINODONT
CYPRINODONTS
CYPRINOID
CYPRINOIDS
CYPRIPEDIA
CYPRIPEDIUM
CYPRIPEDIUMS
CYPRIS
CYPROHEPTADINE
CYPROHEPTADINES
CYPROTERONE
CYPROTERONES
CYPRUS
CYPRUSES
CYPSELA
CYPSELAE

33 words start with CYP.