Congrats

Lillian28
prachita00
MillyJn
The_elegantEnchanter
@nishanth_tamilan

Wow... proud of you my dear children..

ANSWER:

The letter is "D"

The words are

Cod, Nod, Dead, Did

Is that clear?

Am I correct?

Shall we proceed?

Then feel free to vote, comment your views, ideas.....