Epistasis is a term used in genetics to describe the interaction between two or more genes that affect a single trait. There are several synonyms for this word, including gene interaction, genetic interaction, or simply epistatic. These terms are often used interchangeably and refer to the same phenomenon occurring in genetic studies. Other related terms include modifier genes, which are genes that affect the expression of other genes, and suppressor genes, which are genes that counteract the effects of other genes. Understanding the complex interactions between genes is crucial to understanding genetic disorders and developing targeted treatments and therapies.