12-Letter Words Matching ________IU__

There are 23 12-letter words that match ________IU__. 10 are common words, such as CALIFORNIUMS and CONDOMINIUMS. A rarer one is TETRAZOLIUMS. 2 words contain a doubled letter.

Full list 23

californiumscondominiumscrematoriumseinsteiniumsequilibriumsmendeleviumspandemoniumspericardiumsplanetariumsquadrenniumsantheridiumsclostridiumsendocardiumsendometriumsunnilhexiumsantependiumscypripediumsleprosariumsmagisteriumspelargoniumsphosphoniumspositroniumstetrazoliums

About this list

Words
23 (10 common words)
Common example
californiums
Rare example
tetrazoliums
Doubled letters
2
Ending in S
23

Questions

How many 12-letter words matching ________iu__ are there?

23. 10 of them are common words.

What is a common example?

CALIFORNIUMS is among the common words in this set.