9-Letter Words Matching ___T_D___

There are 21 9-letter words that match ___T_D___. 9 are common words, such as BIRTHDAYS and CUSTODIAL. A rarer one is RHYTIDOME. 1 words contain a doubled letter.

Full list 21

birthdayscustodialcustodiancustodiesmastodonsquotidianrestudiedrestudiesunstudiedhistidinepeptidasebestuddedbirthdatehistidinsmastodontmontadalemultidrugpastedownpintadoesprotodermrhytidome

About this list

Words
21 (9 common words)
Common example
birthdays
Rare example
rhytidome
Doubled letters
1
Ending in S
6

Questions

How many 9-letter words matching ___t_d___ are there?

21. 9 of them are common words.

What is a common example?

BIRTHDAYS is among the common words in this set.