15-Letter Words Matching ____T__R_______

There are 19 15-letter words that match ____T__R_______. 3 are common words, such as ARBITRARINESSES and HYPOTHYROIDISMS. A rarer one is SPINTHARISCOPES. 11 words contain a doubled letter.

Full list 19

arbitrarinesseshypothyroidismstrustworthinessornithorhynchusreauthorizationstratigraphicaltelethermometeruninterruptedlyuninterruptibleallotetraploidsallotetraploidyautotetraploidsautotetraploidycounterrallyingcounterreactioncounterreformercounterresponsesemiterrestrialspinthariscopes

About this list

Words
19 (3 common words)
Common example
arbitrarinesses
Rare example
spinthariscopes
Doubled letters
11
Ending in S
7

Questions

How many 15-letter words matching ____t__r_______ are there?

19. 3 of them are common words.

What is a common example?

ARBITRARINESSES is among the common words in this set.