Frequently in Christianity, a distinction is made between "liturgical" and "non-liturgical" churches based on how elaborate or antiquated the worship; in this usage, churches whose services are unscripted or improvised are called "non-liturgical".
The term "liturgy" literally in Greek means "work for the people", but a better translation is "public service" or "public work", as made clear from the origin of the term as described above.