14-Letter Words Matching __R_T_________

There are 21 14-letter words that match __R_T_________. 4 are common words, such as IRRITABILITIES and MERETRICIOUSLY. A rarer one is TERATOGENICITY. In this set, I is the most frequent open letter (19 words). 5 words contain a doubled letter.

Full list 21

irritabilitiesmeretriciouslyscratchinessesstratificationforethoughtfulkarstificationkeratoplastiesparatacticallyscrutinizationstretchabilityheritabilitiesirrationalismsirrationalistskeratinizationkeratinophilicnorethindronesperitrichouslyserotoninergicstratigraphiesstratovolcanosteratogenicity

About this list

Words
21 (4 common words)
Common example
irritabilities
Rare example
teratogenicity
Doubled letters
5
Ending in S
9
Most frequent letter
I (19)

Questions

How many 14-letter words matching __r_t_________ are there?

21. 4 of them are common words.

What is a common example?

IRRITABILITIES is among the common words in this set.