10-Letter Words Matching _______N_H

There are 12 10-letter words that match _______N_H. 5 are common words, such as EIGHTEENTH and FOURTEENTH. A rarer one is TRAGACANTH. In this set, T is the most frequent open letter (9 words). 6 words contain a doubled letter.

Full list 12

eighteenthfourteenthnineteenththirteenthtrillionthcoelacanthfrontbenchgreenfinchhoneybunchnudibranchpostlaunchtragacanth

About this list

Words
12 (5 common words)
Common example
eighteenth
Rare example
tragacanth
Doubled letters
6
Ending in S
0
Most frequent letter
T (9)

Questions

How many 10-letter words matching _______n_h are there?

12. 5 of them are common words.

What is a common example?

EIGHTEENTH is among the common words in this set.