12-Letter Words Matching _________ID_

There are 42 12-letter words that match _________ID_. 7 are common words, such as CHAMBERMAIDS and HAEMORRHOIDS. A rarer one is TENEBRIONIDS. 8 words contain a doubled letter.

Full list 42

Common words

chambermaidshaemorrhoidshypothyroidsmountainsideparathyroidsparatyphoidstriglycerideantherozoidscoloquintidadisaccharideferricyanideferrocyanide
chambermaidshaemorrhoidshypothyroidsmountainsideparathyroidsparatyphoidstriglycerideantherozoidscoloquintidadisaccharideferricyanideferrocyanidehyperboloidshypocycloidsmonochlorideparasiticideradionuclidescorpaenoidssulphonamidetryparsamidecannabinoidschalcogenidechrysomelidscounterraidscryptorchidscrystalloidsdinucleotidediphtheroidsendoperoxideglutethimideglycopeptideheteroploidsheteroploidyhypodiploidyketosteroidsmethysergidemolluscicideneuropeptidenicotinamidepentapeptidestaphylinidstenebrionids

About this list

Words
42 (7 common words)
Common example
chambermaids
Rare example
tenebrionids
Doubled letters
8
Ending in S
19

Questions

How many 12-letter words matching _________id_ are there?

42. 7 of them are common words.

What is a common example?

CHAMBERMAIDS is among the common words in this set.