ORB
ORBED
ORBICULAR
ORBICULARES
ORBICULARIS
ORBICULARITIES
ORBICULARITY
ORBICULARLY
ORBICULATE
ORBICULATED
ORBIER
ORBIEST
ORBING
ORBIT
ORBITA
ORBITAL
ORBITALLY
ORBITALS
ORBITAS
ORBITED
ORBITER
ORBITERS
ORBITIES
ORBITING
ORBITS
ORBITY
ORBLESS
ORBS
ORBY

29 words start with ORB.