9-Letter Words Matching _____A_P_

There are 21 9-letter words that match _____A_P_. 5 are common words, such as FIREDAMPS and HEADLAMPS. A rarer one is XYLOCARPS. In this set, S is the most frequent open letter (18 words). 5 words contain a doubled letter.

Full list 21

firedampsheadlampslagniappemetacarpislaphappyascocarpsblowlampsoverhappybaaskaapscantraipsendocarpsmesocarpsminicampsmoldwarpsmonocarpspedipalpspericarpsprestampstaillampstieclaspsxylocarps

About this list

Words
21 (5 common words)
Common example
firedamps
Rare example
xylocarps
Doubled letters
5
Ending in S
17
Most frequent letter
S (18)

Questions

How many 9-letter words matching _____a_p_ are there?

21. 5 of them are common words.

What is a common example?

FIREDAMPS is among the common words in this set.