Liturgiology :: Liturgiology (n.) The science treating of liturgical matters; a treatise on, or description of, liturgies..
Liturgist :: Liturgist (n.) One who favors or adheres strictly to a liturgy.
Liturgy :: Liturgy (a.) An established formula for public worship, or the entire ritual for public worship in a church which uses prescribed forms; a formulary for public prayer or devotion. In the Roman Catholic Church it includes all forms and services in any language, in any part of the world, for the celebration of Mass..