15-Letter Words Starting With AD

There are 12 15-letter words that start with AD. 3 are common words, such as ADMINISTRATIONS and ADMISSIBILITIES. A rarer one is ADVISABLENESSES. In this set, S is the most frequent open letter (12 words). 5 words contain a doubled letter.

Full list 12

administrationsadmissibilitiesadventurousnessadenocarcinomasadenoidectomiesadmirablenessesadenohypophysesadenohypophysisadjustabilitiesadrenalectomiesadversarinessesadvisablenesses

About this list

Words
12 (3 common words)
Common example
administrations
Rare example
advisablenesses
Doubled letters
5
Ending in S
12
Most frequent letter
S (12)

Questions

How many 15-letter words starting with ad are there?

12. 3 of them are common words.

What is a common example?

ADMINISTRATIONS is among the common words in this set.