11-Letter Words Matching ________OI_

There are 25 11-letter words that match ________OI_. 5 are common words, such as AVOIRDUPOIS and COUNTERFOIL. A rarer one is TUBERCULOID. In this set, D is the most frequent open letter (21 words). 3 words contain a doubled letter.

Full list 25

Common words

avoirdupoiscounterfoilhypothyroidparathyroidparatyphoidamphichroicantherozoidcrystalloiderysipeloidhyperboloidhypocycloidscarabaeoid
avoirdupoiscounterfoilhypothyroidparathyroidparatyphoidamphichroicantherozoidcrystalloiderysipeloidhyperboloidhypocycloidscarabaeoidscorpaenoidvaricelloidantithyroidantityphoidcannabinoiddiphtheroidepithelioidheteroploidhypodiploidketosteroidmetasequoiaoverexploittuberculoid

About this list

Words
25 (5 common words)
Common example
avoirdupois
Rare example
tuberculoid
Doubled letters
3
Ending in S
1
Most frequent letter
D (21)

Questions

How many 11-letter words matching ________oi_ are there?

25. 5 of them are common words.

What is a common example?

AVOIRDUPOIS is among the common words in this set.