The current study aims to investigate lexical variations between the dialects spoken in Baghdad and Najaf, two linguistically significant cities in Iraq. The research focuses on the vocabulary that characterizes these two dialects, offering insights into the country’s regional linguistic diversity. Key concepts such as language, society, Iraqi Arabic, and dialectology are examined to lay the groundwork for the analysis. Data were collected using semi-structured interviews, providing an in-depth exploration of vocabulary use by people in both governorates. Finally, the findings indicate that there are significant regional variations in the vocabulary used in social interactions in the Baghdad and Najaf dialects, reflecting the unique identity of each region and the rich linguistic diversity present in Iraq. In addition, many historical, religious, social, and cultural factors play a significant role in shaping the lexical features of the dialects in these two cities.