rat (răt)

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1. Definition

• Any of several long-tailed rodents of the family Muridae, of the genus Rattus and related genera, distinguished from the mouse by being larger.
• Any of various animals similar to one of these long-tailed rodents.

2. Slang

• A person who abandons or betrays his or her party or associates, especially in a time of trouble.
• A person who frequents a specified place.

fiend (fēnd)

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1. Definition

• A person or thing that causes mischief or annoyance.
• A diabolically cruel or wicked person.
• An evil spirit or demon.

2. Slang

• A person who is extremely addicted to some pernicious habit.
• A person who is excessively interested in some game, sport, etc.