liturgy (n.)

• celebration
• ceremonial
• ceremony
• church
• commencement
• compline
• convocation
• duty
• evensong
• exercise
• exercises
• form
• formal
• formality
• formula
• formulary
• function
• graduation
• inaugural
• inauguration
• initiation
• institution
• matins
• meeting
• mummery
• mystery
• none
• nones
• novena
• observance
• office
• ordinance
• performance
• practice
• prayer
• prime
• revival
• rite
• ritual
• rituality
• sacrament
• service
• sext
• solemnity
• solemnization
• tierce
• vesper
• vespers