12-Letter Words Matching _________EA_

There are 16 12-letter words that match _________EA_. 2 are common words, such as FOUNTAINHEAD and SUBTERRANEAN. A rarer one is STEATORRHEAS. In this set, R is the most frequent open letter (15 words). 3 words contain a doubled letter.

Full list 16

fountainheadsubterraneanendotrachealextranuclearinternuclearintranuclearmultinuclearproboscideancounterpleashydroxyureasmacronuclearmultiwarheadnoncollinearphotonuclearsemiarborealsteatorrheas

About this list

Words
16 (2 common words)
Common example
fountainhead
Rare example
steatorrheas
Doubled letters
3
Ending in S
3
Most frequent letter
R (15)

Questions

How many 12-letter words matching _________ea_ are there?

16. 2 of them are common words.

What is a common example?

FOUNTAINHEAD is among the common words in this set.