That could be an 'orator' or 'lecturer' .
That would be a disciple.
talkative
A person who speaks less is often referred to as reserved or taciturn. They may also be described as introverted or succinct in their communication style.
eugoogalizer
That would be a disciple.
a linguist
Pretentious.
profound or sentimental
A person who speaks four languages is called a quadrilingual.
A native English speaker.
A person who speaks many languages is often called a polyglot.
A person who is fluent in many languages is often referred to as a polyglot.