14-Letter Words Matching ___A_____O____

There are 17 14-letter words that match ___A_____O____. 4 are common words, such as ADVANTAGEOUSLY and CLEARINGHOUSES. A rarer one is SUBARACHNOIDAL. In this set, S is the most frequent open letter (14 words). 1 words contain a doubled letter.

Full list 17

advantageouslyclearinghousesmetamorphosingparapsychologygynandromorphsmetapsychologyorganochlorineparasitologistrepartitioningbreaststrokersdisaccustominggynandromorphyinharmoniouslymetafictionistnonantibioticsparasitologiessubarachnoidal

About this list

Words
17 (4 common words)
Common example
advantageously
Rare example
subarachnoidal
Doubled letters
1
Ending in S
5
Most frequent letter
S (14)

Questions

How many 14-letter words matching ___a_____o____ are there?

17. 4 of them are common words.

What is a common example?

ADVANTAGEOUSLY is among the common words in this set.