15-Letter Words Matching _A___R_________

There are 14 15-letter words that match _A___R_________. 7 are common words, such as BACTERIOLOGICAL and BACTERIOLOGISTS. A rarer one is RAPTUROUSNESSES. In this set, E is the most frequent open letter (13 words). 10 words contain a doubled letter.

Full list 14

bacteriologicalbacteriologistsbastardizationsdaguerreotypingdastardlinessesmaladroitnessestatterdemalionsbarbarousnessesdangerousnessesbacteriophagiesdaguerreotypiesdaguerreotypistmasterfulnessesrapturousnesses

About this list

Words
14 (7 common words)
Common example
bacteriological
Rare example
rapturousnesses
Doubled letters
10
Ending in S
11
Most frequent letter
E (13)

Questions

How many 15-letter words matching _a___r_________ are there?

14. 7 of them are common words.

What is a common example?

BACTERIOLOGICAL is among the common words in this set.