15-Letter Words Matching __T__R_________

There are 23 15-letter words that match __T__R_________. 4 are common words, such as AUTHORITATIVELY and INTERROGATIVELY. A rarer one is WITHDRAWNNESSES. In this set, I is the most frequent open letter (21 words). 13 words contain a doubled letter.

Full list 23

authoritativelyinterrogativelyinterrogatoriestatterdemalionsantiprohibitionautographicallyautotransformerinterrogationalinterrogatorilyantiarrhythmicsantiprogressiveantitraditionalautotransfusionautotrophicallybittersweetnessdeterrabilitiesdithyrambicallyintegrabilitiesintegrationistsretroreflectionretroreflectiveretroreflectorswithdrawnnesses

About this list

Words
23 (4 common words)
Common example
authoritatively
Rare example
withdrawnnesses
Doubled letters
13
Ending in S
9
Most frequent letter
I (21)

Questions

How many 15-letter words matching __t__r_________ are there?

23. 4 of them are common words.

What is a common example?

AUTHORITATIVELY is among the common words in this set.