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 love to twist and dance. Though wingless I fly high up into the sky.
I have a title and many pages. I am a genteel of genteel descent. I am a killer veteran of war. I am a slave to my lord pledged to his service.
I jump when I walk and sit when I stand.
Flat as a leaf round as a ring. I have two eyes but can't see a thing.
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk