The word "fibber" is an informal term for someone who tells lies or fibs. There are many synonyms that can be used to describe a "fibber," such as liar, deceiver, prevaricator, dissembler, falsifier, cheat, trickster, and fabricator. Each of these words implies a different aspect of telling lies, from intentional deception to concealing the truth. For example, a "deceiver" may use cunning or trickery to mislead others, while a "falsifier" may manipulate evidence to create a false impression. No matter which synonym is used, it is clear that a "fibber" is someone who cannot be trusted to tell the truth.