1) Divinity 2) Liturgiology 3) The study of liturgies 4) Theology 1) Liturgiology 
Liturgics is the academic discipline dedicated to the study of liturgy. Liturgics scholars typically specialize in a single approach drawn from another scholarly field. The most common sub-disciplines are: history or church history, theology, and anthropology. Although liturgics scholars using these approaches apply the principles of their respect...
• (n.) The science of worship; history, doctrine, and interpretation of liturgies.
Li·tur'gics noun The science of worship; history, doctrine, and interpretation of liturgies. 
[n] - the study of liturgies
liturgiology noun the study of liturgies