Chad is a possible country with 4 letters that start with a c and end with a d. There is possibly Another Country out there that may have the same characteristics, too. Countries could be on a far off piece of land that we don't know that may start with c and end with d and have four letters, but we wouldn't know because they are hidden from view.
boob
Seal or swan.
teal
There are two countries that start with the letter "I" with 4 letters. Iran and Iraq
Mont Clare
No 4 letter country starts with C and ends with "ch". Chad and Cuba are the only 4 letter countries that start with the letter C. Chad, Chile and China are countries that start with "Ch". No country ends with the letters "ch".
AVIA
boob
Tutu, tofu, thou
It could be Anna.
Seal or swan.
teal
suha
The word is echo.
erne
This is not a very good question.
One such is "epiglottis."