4-Letter Words Matching A__A

There are 20 4-letter words that match A__A. 5 are common words, such as ALGA and AQUA. A rarer one is ATMA. In this set, N is the most frequent open letter (5 words). 2 words contain a doubled letter.

Full list 20

algaaquaareaariaauraabbaaghaagmaalbaannaanoaantaactaalfaalmaamiaangaansaaseaatma

About this list

Words
20 (5 common words)
Common example
alga
Rare example
atma
Doubled letters
2
Ending in S
0
Most frequent letter
N (5)

Questions

How many 4-letter words matching a__a are there?

20. 5 of them are common words.

What is a common example?

ALGA is among the common words in this set.