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There are 4 twelve-letter words beginning with PERIOD

PERIODICALLYperiodically adv. In a manner that is regular or periodic.
periodically adv. Intermittently or recurrently.
PERIODICAL adv. periodic.
PERIODONTIASPERIODONTIA n. the branch of dentistry concerned with periodontal diseases.
PERIODONTICSperiodontics n. (Dentistry) The study of supporting structures of teeth—gums, alveolar bone, cementum, and the periodontal…
PERIODONTICS n. the study of gums, as a branch of dentistry.
PERIODONTISTperiodontist n. A dentist whose speciality is periodontics.
PERIODONTIST n. a dentist specialising in periodontics.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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