The Romans did not have pens in their time, so they did not have a specific word for a ballpoint pen. The closest translation I can give you is:
penicillus, -i (masculine) a painter's brush or pencil
The Latin word for pen is 'calamus'.
Karamu is the Kikuyu word for the English word pen.
Pen as in writing instrument has evolved from the Latin word penna meaning feather (as feathers were used to make writing instruments at one time) Pen as in animal enclosure is from an old English word.
Nearly is the English equivalent of the Latin root 'pen-'. A Latin derivative of the Latin root is the adverb 'paene', which also means 'nearly'. An English derivative is the adjective 'penultimate', which means 'nearly last' or 'next to last'.
The African Luhya term for the English word pen is Ikalamu.
The English word for the Latin word "credere" is "believe."
The English word for the Latin word "portare" is "to carry."
The English word for the Latin word "cord" is "heart."
Camel is an English word. It is camelus in Latin.
The word latin in the English language would be Latin.
One Latin equivalent to the English word 'conversation' is 'conloquium'. An English derivative of that original Latin word is colloquy. Another Latin equivalent to the English word 'conversation' is 'sermo'. An English derivative of that original Latin word is sermon.
Sometimes we use a word 'pena' for a pen or a quill. Commonly used word for 'pen' is 'bolpoin'(read: bol-po-in), which I believe is a domesticated (and truncated) form of the English word 'ball point pen'.