15-Letter Words Matching ___T______O____

There are 15 15-letter words that match ___T______O____. 5 are common words, such as BIOTECHNOLOGIES and INSTANTANEOUSLY. A rarer one is SUBTERRANEOUSLY. In this set, I is the most frequent open letter (14 words). 3 words contain a doubled letter.

Full list 15

biotechnologiesinstantaneouslyophthalmologiesophthalmologistweatherproofingbiotechnologistcontradictorilymastoidectomiesmultitudinouslycontainerboardscontradictorieshistophysiologymontmorilloniteplatitudinouslysubterraneously

About this list

Words
15 (5 common words)
Common example
biotechnologies
Rare example
subterraneously
Doubled letters
3
Ending in S
5
Most frequent letter
I (14)

Questions

How many 15-letter words matching ___t______o____ are there?

15. 5 of them are common words.

What is a common example?

BIOTECHNOLOGIES is among the common words in this set.