Words that start with 'u' and contain 'thd'

In total, how many words is it possible to make using the combination of letters requested?
It's possible to assemble 5 words with the specified combination.

How many characters does the largest word on this page contain?
The largest word you can construct from words that start with 'u' and include 'thd' is 'unwithdrawable', which is made up of 14 letters.