15-Letter Words Matching ____I_U________

There are 21 15-letter words that match ____I_U________. 4 are common words, such as HORTICULTURISTS and INSTITUTIONALLY. A rarer one is SPIRITUALNESSES. In this set, T is the most frequent open letter (21 words). 5 words contain a doubled letter.

Full list 21

horticulturistsinstitutionallyparticularitiesparticularizingconfigurationalhorticulturallymultifunctionalmultitudinouslycitriculturistsdestitutenessesfloriculturistsnonsimultaneousparticularisingparticularisticplatitudinarianplatitudinizingplatitudinouslyprefigurativelysilviculturallysilviculturistsspiritualnesses

About this list

Words
21 (4 common words)
Common example
horticulturists
Rare example
spiritualnesses
Doubled letters
5
Ending in S
8
Most frequent letter
T (21)

Questions

How many 15-letter words matching ____i_u________ are there?

21. 4 of them are common words.

What is a common example?

HORTICULTURISTS is among the common words in this set.