12-Letter Words Starting With O – 787 Words from Word Finder

Among all 12-letter words, 787 of them start with O, and our Word Finder extracted all these words from the dictionary and listed them on this page. We also have a list of 12-letter words ending in O and words with O.

If you need to explore more words that start with O, from 2 to 28 letters long, check out our page of all words starting with Oin the dictionary.

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12 letter words (787 words)
ORGANIZATION​22
ORGANISATION​13
OPTIMIZATION​25
OBSERVATIONS​17
OCCUPATIONAL​18
OCCASIONALLY​19
OVERWHELMING​24
OSTEOPOROSIS​14
OPTIMISATION​16
OCEANOGRAPHY​23
OVERCLOCKING​24
OSCILLATIONS​14
ORIENTATIONS​12
OPTOMETRISTS​16
ORTHOPAEDICS​20
OBSTRUCTIONS​16
ORCHESTRATED​18
ORIENTEERING​13
OSCILLOSCOPE​18
ORTHODONTICS​18

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If you want to use these words for Scrabble, here are a couple of interesting insights that will help you with your choice:

The average Scrabble value for 12-letter words starting with the letter O is 18.9.
The most points in Scrabble for words from this group you can score is 36 by playing the word OBJECTIVIZED.
12-letter words that start with O mostly end with the letter S, 324 of them.