12-Letter Words Matching _____DO_____

There are 23 12-letter words that match _____DO_____. 10 are common words, such as KALEIDOSCOPE and ORTHODONTIAS. A rarer one is WATCHDOGGING. In this set, I is the most frequent open letter (18 words). 3 words contain a doubled letter.

Full list 23

kaleidoscopeorthodontiasorthodonticsorthodontistperiodonticsperiodontistpetrodollarsthalidomidesunpardonableunpardonablydiplodocusesorthodonturepteridophytesubabdominalwitchdoctorscrocidolitesdisendowmentlabradoritesoleandomycinpteridospermsacerdotallytetrodotoxinwatchdogging

About this list

Words
23 (10 common words)
Common example
kaleidoscope
Rare example
watchdogging
Doubled letters
3
Ending in S
9
Most frequent letter
I (18)

Questions

How many 12-letter words matching _____do_____ are there?

23. 10 of them are common words.

What is a common example?

KALEIDOSCOPE is among the common words in this set.