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Liar
A lie is a statement used intentionally for the purpose of deception. The practice of communicating lies is called lying, and a person who communicates a lie may be termed a liar. Lies may be employed to serve a variety of instrumental, interpersonal, or psychological functions for the individuals who use them. Generally, the term “lie” carries a negative connotation, and depending on the context a person who communicates a lie may be subject to social, legal, religious, or criminal sanctions.
Wikipedia
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Liar (noun)
One who tells lies.
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Lier (noun)
A person or thing that lies, in the sense of being horizontal.
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Lier (noun)
obsolete spelling of liar
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Lier (noun)
misspelling of liar
Wiktionary