15-Letter Words Matching ____TR_________

There are 58 15-letter words that match ____TR_________. 9 are common words, such as ARBITRARINESSES and CONSTRUCTIONIST. A rarer one is UNEXTRAORDINARY. In this set, O is the most frequent open letter (51 words). 9 words contain a doubled letter.

Full list 58

Common words

arbitrarinessesconstructionistelectrificationelectromagneticpenetrabilitiesreintroductionssemitransparenttheatricalitiesunobtrusivenesselectrodynamicsautotransformerconstructivisms
arbitrarinessesconstructionistelectrificationelectromagneticpenetrabilitiesreintroductionssemitransparenttheatricalitiesunobtrusivenesselectrodynamicsautotransformerconstructivismsconstructivistsdenitrificationelectroanalysiselectrochemicalelectrodialysiselectrokineticselectronarcosiselectronegativeelectrophoreseselectrophoresiselectrophoreticelectropositiveelectrotechnicselectrothermicsinextricabilityspectroscopicalsubstratosphereantitraditionalautotransfusionautotrophicallybiostratigraphyboustrophedoniccomptrollershipdevitrificationdiastrophicallydinitrobenzeneselectroacousticelectroanalyseselectrodepositselectrodialyseselectrodialyticelectrofishingselectromyogramselectromyographelectrophoresedelectrosurgicalelectrowinningsgeostrophicallyhomotransplantsmonstrousnessesposttransfusionsemitranslucentspectrographiesspectroscopiststheatricalizingunextraordinary

About this list

Words
58 (9 common words)
Common example
arbitrarinesses
Rare example
unextraordinary
Doubled letters
9
Ending in S
27
Most frequent letter
O (51)

Questions

How many 15-letter words matching ____tr_________ are there?

58. 9 of them are common words.

What is a common example?

ARBITRARINESSES is among the common words in this set.