List plural words ending in double i?

Answer 1

Skiing, radii, genii (plural radius and plural genius).

And of course, Hawaii, Hawaiian, taxiing, safariing, shanghaiing and also Shiite.

Wii could be considered a word of the English language, but it is more of a personal name for a gaming system.

Also, the abbreviation Ascii is sometimes treated and pronounced as a word.

Another word is inferii (The plural for inferius).

Answer 2

radii (plural of radius) denarii (plural of denarius, a small silver Roman coin)