Hamartiology is a theological term used to describe the study of sin. There are several synonyms for this word that can be used alternatively in different contexts. For instance, the word "peccadillo" can be used to describe a minor sin. The words "misdeed", "transgression", "iniquity", "trespass", and "wickedness" can be used to denote various sinful acts. Similarly, "depravity" is a word that describes the state of being morally corrupt. "Malfeasance" is another word that can be used to suggest wrongdoing or illegal activity. Other words that can be used interchangeably with "hamartiology" include "fallen nature", "original sin", and "the doctrine of sin".