OPE
OPED
OPEIDOSCOPE
OPEIDOSCOPES
OPEN
OPENABILITIES
OPENABILITY
OPENABLE
OPENCAST
OPENED
OPENER
OPENERS
OPENEST
OPENHANDED
OPENHANDEDLY
OPENHANDEDNESS
OPENHEARTED
OPENHEARTEDLY
OPENHEARTEDNESS
OPENING
OPENINGS
OPENLY
OPENMOUTHED
OPENMOUTHEDLY
OPENMOUTHEDNESS
OPENNESS
OPENNESSES
OPENS
OPENSIDE
OPENSIDES
OPENWORK
OPENWORKS
OPEPE
OPEPES
OPERA
OPERABILITIES
OPERABILITY
OPERABLE
OPERABLY
OPERAGOER
OPERAGOERS
OPERAGOING
OPERAGOINGS
OPERAND
OPERANDS
OPERANT
OPERANTLY
OPERANTS
OPERAS
OPERATE
OPERATED
OPERATES
OPERATIC
OPERATICALLY
OPERATICS
OPERATING
OPERATION
OPERATIONAL
OPERATIONALISM
OPERATIONALISMS
OPERATIONALIST
OPERATIONALISTS
OPERATIONALLY
OPERATIONISM
OPERATIONISMS
OPERATIONIST
OPERATIONISTS
OPERATIONS
OPERATISE
OPERATISED
OPERATISES
OPERATISING
OPERATIVE
OPERATIVELY
OPERATIVENESS
OPERATIVENESSES
OPERATIVES
OPERATIVITIES
OPERATIVITY
OPERATIZE
OPERATIZED
OPERATIZES
OPERATIZING
OPERATOR
OPERATORLESS
OPERATORS
OPERCELE
OPERCELES
OPERCULA
OPERCULAR
OPERCULARS
OPERCULATE
OPERCULATED
OPERCULE
OPERCULES
OPERCULUM
OPERCULUMS
OPERETTA
OPERETTAS
OPERETTIST
OPERETTISTS
OPERON
OPERONS
OPEROSE
OPEROSELY
OPEROSENESS
OPEROSENESSES
OPEROSITIES
OPEROSITY
OPES

110 words start with OPE.