11-Letter Words Matching A_________A

There are 14 11-letter words that match A_________A. 3 are common words, such as ABRACADABRA and AGORAPHOBIA. A rarer one is AZOOSPERMIA. In this set, I is the most frequent open letter (12 words). 2 words contain a doubled letter.

Full list 14

abracadabraagoraphobiaanaesthesiaalbuminuriaamphisbaenaanacoluthiaaniseikoniaantonomasiaastraphobiaantimalariaappressoriaarchesporiaastrocytomaazoospermia

About this list

Words
14 (3 common words)
Common example
abracadabra
Rare example
azoospermia
Doubled letters
2
Ending in S
0
Most frequent letter
I (12)

Questions

How many 11-letter words matching a_________a are there?

14. 3 of them are common words.

What is a common example?

ABRACADABRA is among the common words in this set.