14-Letter Words Matching __R_________A_

There are 20 14-letter words that match __R_________A_. 7 are common words, such as CARDIOVASCULAR and CIRCUMSTANTIAL. A rarer one is XEROPHTHALMIAS. In this set, I is the most frequent open letter (20 words). 2 words contain a doubled letter.

Full list 20

cardiovascularcircumstantialdermatologicalgerontologicaljurisdictionalparaphernaliasterminologicalcartographicalchronometricalferromagnesianherpetologicalphraseologicaladrenocorticalaerobiologicalmyrmecologicalnarratologicalparainfluenzasperturbationalsyringomyeliasxerophthalmias

About this list

Words
20 (7 common words)
Common example
cardiovascular
Rare example
xerophthalmias
Doubled letters
2
Ending in S
4
Most frequent letter
I (20)

Questions

How many 14-letter words matching __r_________a_ are there?

20. 7 of them are common words.

What is a common example?

CARDIOVASCULAR is among the common words in this set.