13-Letter Words Matching A__________R_

There are 17 13-letter words that match A__________R_. 4 are common words, such as ALPHABETIZERS and AMPHITHEATERS. A rarer one is ASSASSINATORS. In this set, T is the most frequent open letter (16 words). 7 words contain a doubled letter.

Full list 17

alphabetizersamphitheatersantimacassarsappropriatorsanthropolatryanthropometryarboricultureasthenosphereacclimatizersaccommodatorsaccomplishersagroforestersanthologizersantibillboardanticonsumersantipredatorsassassinators

About this list

Words
17 (4 common words)
Common example
alphabetizers
Rare example
assassinators
Doubled letters
7
Ending in S
12
Most frequent letter
T (16)

Questions

How many 13-letter words matching a__________r_ are there?

17. 4 of them are common words.

What is a common example?

ALPHABETIZERS is among the common words in this set.