15-Letter Words Matching ____T_A________

There are 19 15-letter words that match ____T_A________. 5 are common words, such as ARBITRARINESSES and INSATIABILITIES. A rarer one is UNEXTRAORDINARY. In this set, S is the most frequent open letter (17 words). 5 words contain a doubled letter.

Full list 19

arbitrarinessesinsatiabilitiesnegotiabilitiespenetrabilitiessemitransparentautotransformersubstratosphereantitraditionalautotransfusionbiostratigraphybreathabilitiescrestfallennesshomotransplantsinsatiatenesseslightfastnessesposttransfusionsemitranslucentspinthariscopesunextraordinary

About this list

Words
19 (5 common words)
Common example
arbitrarinesses
Rare example
unextraordinary
Doubled letters
5
Ending in S
10
Most frequent letter
S (17)

Questions

How many 15-letter words matching ____t_a________ are there?

19. 5 of them are common words.

What is a common example?

ARBITRARINESSES is among the common words in this set.