12-Letter Words Matching ____I_____U_

There are 16 12-letter words that match ____I_____U_. 4 are common words, such as MULTIFARIOUS and PARSIMONIOUS. A rarer one is PECTINACEOUS. In this set, S is the most frequent open letter (15 words). 2 words contain a doubled letter.

Full list 16

multifariousparsimoniouspertinacioussacrilegiousadscititiousamphicoelousamphitheciumamphitropousgallinaceousmultiflorousorchidaceousplesiosaurusunchivalrousxiphisternumcunnilinctuspectinaceous

About this list

Words
16 (4 common words)
Common example
multifarious
Rare example
pectinaceous
Doubled letters
2
Ending in S
14
Most frequent letter
S (15)

Questions

How many 12-letter words matching ____i_____u_ are there?

16. 4 of them are common words.

What is a common example?

MULTIFARIOUS is among the common words in this set.