-ometer-ometer /ɒmɪtə $ ɑːmɪtər/ suffix [in nouns] 
an instrument for measuring something: 
a speedometer
an instrument for measuring something: a speedometer- discolor
- discoloration
- discolour
- discombobulated
- discomfit
- discomfiture
- discomfort
- discompose
- discomposure
- disconcert
- disconcerted
- disconcerting
- disconcertingly
- disconnect
- disconnected
- disconnection
- disconsolate
- disconsolately
- discontent
- discontented
- discontentedly
- discontinuance
- discontinuation
- discontinue
- discontinuity