13-Letter Words Matching ________R_A__

There are 32 13-letter words that match ________R_A__. 14 are common words, such as ANTIMALARIALS and BACCALAUREATE. A rarer one is TURBELLARIANS. In this set, I is the most frequent open letter (27 words). 10 words contain a doubled letter.

Full list 32

Common words

antimalarialsbaccalaureatecommissariatshumanitariansinappropriateintermarriagenonagenariansoctogenarianssalutatorianssexagenariansthenceforwardtotalitarians
antimalarialsbaccalaureatecommissariatshumanitariansinappropriateintermarriagenonagenariansoctogenarianssalutatorianssexagenariansthenceforwardtotalitariansundercarriageveterinariansequalitariansmajoritariansprehistoriansprofessoriateprotochordateyellowthroatschateaubriandfutilitarianshereditariansnonlibrariansnonuniversalspreceptorialspresbyterialsprofessoriatsreappropriatesclerodermatasublibrariansturbellarians

About this list

Words
32 (14 common words)
Common example
antimalarials
Rare example
turbellarians
Doubled letters
10
Ending in S
22
Most frequent letter
I (27)

Questions

How many 13-letter words matching ________r_a__ are there?

32. 14 of them are common words.

What is a common example?

ANTIMALARIALS is among the common words in this set.