Compiler
A person who bring new book is called
Compiler
Publisher
It is called pyromania. The person is a pyromaniac, or firebug.
A word that substitutes for a noun is a pronoun, which must match the noun in person, number, gender. This is called pronoun-antecedent agreement.
penniless
bookworm
"Precipitous" means a cloud brings rain.
A bibliophile loves books
One possible substitute for "their" is "his" or "her" depending on the gender of the person/people being referred to. Another substitute can be "its" when referring to a non-human object or entity.
The word is optimist.(A person who is negative is a pessimist.)
An invalid
One word is reprobate.
The word could be "nitpicker."
The word is busybody.
The word brings is the present tense, third person, for the verb to bring. He brings me coffee every morning.
Normally it is an administrator or manager.
An eavesdropper.
Commendation
masochist