13-Letter Words Matching ____T____O___

There are 21 13-letter words that match ____T____O___. 6 are common words, such as ELECTROSCOPES and ELECTROSCOPIC. A rarer one is WHISTLEBLOWER. 4 words contain a doubled letter.

Full list 21

electroscopeselectroscopicelectroshocksspectroscopesspectroscopicunintentionalcountinghouseelectrophorusquintilliontharbitrationalblastomycosesblastomycosiscreaturehoodscytotaxonomicendotheliomasfluctuationalmesotheliomasparathormonesposttensionedthrottleholdswhistleblower

About this list

Words
21 (6 common words)
Common example
electroscopes
Rare example
whistleblower
Doubled letters
4
Ending in S
11

Questions

How many 13-letter words matching ____t____o___ are there?

21. 6 of them are common words.

What is a common example?

ELECTROSCOPES is among the common words in this set.