An aryl group refers to a particular type of chemical group consisting of an aromatic ring substituent. Synonyms for the term "aryl group" can vary depending on the context and scientific field. In organic chemistry, it may be referred to as an aromatic group or aromatic moiety. This harks back to the aromaticity of the compound. Additionally, the aryl group can be called a phenyl group, specifically if it directly consists of a benzene ring. Some may even use the term arylene, especially when describing a series of aromatic rings together. It is important to note that while these terms are often used interchangeably, they may have specific connotations that rely on the structural characteristics and chemical properties of the group.