12-Letter Words Matching ____A__D____

There are 17 12-letter words that match ____A__D____. 2 are common words, such as PREPAREDNESS and TETRAHEDRONS. A rarer one is UNBIASEDNESS. In this set, E is the most frequent open letter (16 words). 6 words contain a doubled letter.

Full list 17

preparednesstetrahedronsachlamydeousicosahedronsostracodermspentahedronstarradiddlesantiacademiccotransducedcotransducesdepravednesseducatednessoutdatednesspentamidinestetrahedriteultraradicalunbiasedness

About this list

Words
17 (2 common words)
Common example
preparedness
Rare example
unbiasedness
Doubled letters
6
Ending in S
13
Most frequent letter
E (16)

Questions

How many 12-letter words matching ____a__d____ are there?

17. 2 of them are common words.

What is a common example?

PREPAREDNESS is among the common words in this set.