13-Letter Words Matching ___I_____U___

There are 20 13-letter words that match ___I_____U___. 6 are common words, such as ACRIMONIOUSLY and EFFICACIOUSLY. A rarer one is VENIPUNCTURES. In this set, R is the most frequent open letter (18 words). 2 words contain a doubled letter.

Full list 20

acrimoniouslyefficaciouslymeritoriouslyredistributedredistributesundistributedredistributoracciaccaturasantiscorbuticequimolecularsinistrocularsocioculturalantimarijuanaantipleasuresjurisconsultsmagistraturesoutintriguingsociolinguistunrighteouslyvenipunctures

About this list

Words
20 (6 common words)
Common example
acrimoniously
Rare example
venipunctures
Doubled letters
2
Ending in S
6
Most frequent letter
R (18)

Questions

How many 13-letter words matching ___i_____u___ are there?

20. 6 of them are common words.

What is a common example?

ACRIMONIOUSLY is among the common words in this set.