7-Letter Words Matching ____D_A

There are 23 7-letter words that match ____D_A. 3 are common words, such as GRANDMA and GRANDPA. A rarer one is SUBIDEA. In this set, I is the most frequent open letter (18 words). 3 words contain a doubled letter.

Full list 23

grandmagrandparesiduabasidiaconidiadeciduadvandvaechidnamelodiaaccidiaaecidiaallodiaarcadiaascidiaephedraexordiagonidiaperidiapygidiapyxidiascandiasraddhasubidea

About this list

Words
23 (3 common words)
Common example
grandma
Rare example
subidea
Doubled letters
3
Ending in S
0
Most frequent letter
I (18)

Questions

How many 7-letter words matching ____d_a are there?

23. 3 of them are common words.

What is a common example?

GRANDMA is among the common words in this set.