Words that contain 'dp' and end in 'ne'

The combination requested has sadly resulted in only 2 entries.

9 letter words

  • headphone
  • landplane

How many letters are in the largest word on this list?
The biggest word on this page is 'headphone', consisting of 9 characters

What's the max number of words one can create using this combination of letters?
From this page of words that contain 'dp' and end in 'ne', there are 2 fantastic combinations that are possible.