12-Letter Words Starting With IS

There are 16 12-letter words that start with IS. 2 are common words, such as ISOLATIONISM and ISOLATIONIST. A rarer one is ISOTONICALLY. In this set, O is the most frequent open letter (16 words). 4 words contain a doubled letter.

Full list 16

isolationismisolationistisochromaticisodiametricisometropiasisomorphismsisopropanolsisothermallyisotopicallyisoantigenicisobutylenesisochronallyisochronismsisoenzymaticisoprenalineisotonically

About this list

Words
16 (2 common words)
Common example
isolationism
Rare example
isotonically
Doubled letters
4
Ending in S
5
Most frequent letter
O (16)

Questions

How many 12-letter words starting with is are there?

16. 2 of them are common words.

What is a common example?

ISOLATIONISM is among the common words in this set.