SIP
SIPE
SIPED
SIPES
SIPHON
SIPHONAGE
SIPHONAGES
SIPHONAL
SIPHONATE
SIPHONED
SIPHONET
SIPHONETS
SIPHONIC
SIPHONING
SIPHONOGAM
SIPHONOGAMIES
SIPHONOGAMS
SIPHONOGAMY
SIPHONOPHORE
SIPHONOPHORES
SIPHONOPHOROUS
SIPHONOSTELE
SIPHONOSTELES
SIPHONOSTELIC
SIPHONS
SIPHUNCLE
SIPHUNCLES
SIPING
SIPPED
SIPPER
SIPPERS
SIPPET
SIPPETS
SIPPING
SIPPLE
SIPPLED
SIPPLES
SIPPLING
SIPPY
SIPS
SIPUNCULID
SIPUNCULIDS
SIPUNCULOID
SIPUNCULOIDS

44 words start with SIP.