There are several synonyms for the word "andnark" which can be used interchangeably depending on the context. One such synonym is "tattler," which refers to someone who gossips or reveals secrets to others. Another synonym is "snitch," which is often used to describe someone who informs on others to authorities in exchange for favors or leniency. "Rat" is another commonly used synonym for "andnark," implying that the person in question is untrustworthy and quick to betray others. Other synonyms for "andnark" include "informer," "whistleblower," and "fink." Regardless of the word used, all these synonyms refer to someone who betrays the trust of others by revealing secrets and sensitive information.