12-Letter Words Matching H_____P_____

There are 12 12-letter words that match H_____P_____. 2 are common words, such as HELICOPTERED and HYDROSPHERES. A rarer one is HYPODIPLOIDY. 1 words contain a doubled letter.

Full list 12

helicopteredhydrospheresheckelphonesheteroplastyhymenopteranhyperspatialheterophyllyheteroploidsheteroploidyhydrospherichymenopteronhypodiploidy

About this list

Words
12 (2 common words)
Common example
helicoptered
Rare example
hypodiploidy
Doubled letters
1
Ending in S
3

Questions

How many 12-letter words matching h_____p_____ are there?

12. 2 of them are common words.

What is a common example?

HELICOPTERED is among the common words in this set.