Domain knowledge is knowledge of a specific, specialised disciplineA specific way, a set of procedures and techniques for a specific activity e.g. the discipline of drawing embraces perspective, figure and conceptual ways of... or field.
A domain model is a formal representation of a knowledgeFacts, information, and skills acquired through experience or education; the theoretical or practical understanding of a subject. domain with concepts, roles, datatypes, individuals, and rules, typically grounded in a description logic.