9-Letter Words Matching ____D_U__

There are 20 9-letter words that match ____D_U__. 8 are common words, such as CROWDFUND and GRANDAUNT. A rarer one is RESIDUUMS. In this set, S is the most frequent open letter (16 words). 1 words contain a doubled letter.

Full list 20

crowdfundgrandauntgrandeursrubidiumsscandiumssourdoughstandoutsvanadiumscaladiumschondruleperidiumspreadjustbreadnutsdreadfulsexordiumsfrondeursmisadjustoncidiumsoverdrunkresiduums

About this list

Words
20 (8 common words)
Common example
crowdfund
Rare example
residuums
Doubled letters
1
Ending in S
13
Most frequent letter
S (16)

Questions

How many 9-letter words matching ____d_u__ are there?

20. 8 of them are common words.

What is a common example?

CROWDFUND is among the common words in this set.