15-Letter Words Matching A____U_________

There are 12 15-letter words that match A____U_________. 3 are common words, such as AGRICULTURALIST and ANTIQUARIANISMS. A rarer one is ANTITUBERCULOUS. In this set, S is the most frequent open letter (12 words). 5 words contain a doubled letter.

Full list 12

agriculturalistantiquarianismsassiduousnessesagranulocytosesagranulocytosisagribusinessmanautosuggestionsagribusinessmenambiguousnessesantisubversionsantisubversivesantituberculous

About this list

Words
12 (3 common words)
Common example
agriculturalist
Rare example
antituberculous
Doubled letters
5
Ending in S
9
Most frequent letter
S (12)

Questions

How many 15-letter words matching a____u_________ are there?

12. 3 of them are common words.

What is a common example?

AGRICULTURALIST is among the common words in this set.