Answer:
The letter S is added to pluralise most words in the English language. eg. Letter to Letters Word to Words and Language to Languages. But I am a word that is pluralised with the addition of the letter C.
I am black within and red without With four corners round about.
What can be heard in court or used to carry briefs?
I can be swallowed, but I can also swallow you. What am I?
I can be cracked, made, told, and played. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic