12-Letter Words Starting With IS – 32 Words from Word Finder

Out of 21,577 words with 12 letters, 32 start with IS, and this page will list all of them to help you with your favorite word game. We generated this list using our Word Finder, which extracted all 12-letter words starting with IS from the dictionary.

The most common ending letter in these words is S, as 11 words from this group end in this letter. If you want to explore more words starting with IS, we have that list prepared, including words from 2 to 28 letters in length.

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12 letters (32 words)
ISOLATIONISM​14
ISOLATIONIST​12
ISOTRETINOIN​12
ISOMORPHISMS​21
ISOTOPICALLY​19
ISOPRENALINE​14
ISOANTIGENIC​15
ISOBILATERAL​14
ISOBUTYLENES​17
ISOCHEIMENAL​19
ISOCHROMATIC​21
ISOCHRONALLY​20
ISOCHRONISED​18
ISOCHRONISES​17
ISOCHRONISMS​19
ISOCHRONIZED​27
ISOCHRONIZES​26
ISODIAMETRIC​17
ISODIAPHERES​18
ISODIMORPHIC​22
ISOENZYMATIC​28
ISOGEOTHERMS​18
ISOMAGNETICS​17
ISOMETROPIAS​16
ISOPERIMETER​16
ISOPERIMETRY​19
ISOSTEMONOUS​14
ISOSTHENURIA​15
ISOTENISCOPE​16
ISOTHERMALLY​20
ISOTONICALLY​17
ISOXSUPRINES​21

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If you’re using these words for Scrabble, here are a few things you should know:

– The average value of 12-letter words starting with IS is 18.1 points – The most points in Scrabble you can get from this list is 28 by playing the word ISOENZYMATIC