Merriam-Webster's Collegiate Dictionary:
disbar
disbarment
disbelief
disbelieve
disbeliever
disbenefit
disbud
disburden
disburdenment
disburse
disbursement
disburser
disc
disc brake
disc jockey
disc-
discalced
discant
discard
discardable
discarder
discarnate
discern
discernable
discerner
discernible
discernibly
discerning
discerningly
discernment
discharge
discharge lamp
discharge tube
dischargeable
dischargee
discharger
disci-
disciform
disciple
discipleship
disciplinable
disciplinal
disciplinarian
disciplinarily
disciplinarity
disciplinary
discipline
disciplined
discipliner
disclaim
disclaimer
disclamation
disclimax
disclose
discloser
disclosing
disclosure
disco
disco-
discographer
discographic
discographical
discographically
discography
discoid
discoidal
discoidal cleavage
discolor
discoloration
discombobulate
discombobulation
discomfit
discomfitingly
discomfiture
discomfort
discomfortable
discommend
discommode
discompose
discomposure
disconcert
disconcerting
disconcertingly
disconcertment
disconfirm
disconfirmation
disconformity
disconnect
disconnected
disconnectedly
disconnectedness
disconnection
disconsolate
disconsolately
disconsolateness
disconsolation
discontent
