The Liturgy of the Eucharist can never be celebrated apart from the Liturgy of the Word. “They form but one single act of worship” (Sacrosanctum Concilium). However, there are services patterned on the Liturgy of the Word which are called “Celebration(s) of the Word of God”.
Before 1970, the liturgical books did not have that much provision for the reading of passages from Scripture outside of the Mass or the Divine Office. In the late 40’s, a type of service now called the Celebration of the Word of God became popular.
These were essentially “Bible services” and initially followed a very loose pattern. The number of readings varied (from one to three or four) and so did their position (e.g. the Gospel might be read first). Some added additional prayers while others restricted themselves to only a prayer, readings and a homily.
These services had advantages of their own. Because they were not liturgical (paraliturgical) they could be conducted in the vernacular, at a time when the Mass was in Latin. The priest could also choose prayers and texts of his own, as he felt the circumstances of the people demanded. And the people got to hear Scripture.
The Celebrations of the Word of God were highly promoted by the Liturgical Movement and became very popular in the late 50’s and early 60’s. The Fathers of the Second Vatican Council approved of it in
Sacrosanctum Concilium (35,4). Following this, the instruction
Inter Oecumenici laid down some of the first guidelines for Celebration(s) of the Word for Sundays and Holy Days. It was decided that “the plan of such a celebration shall be almost the same as that of the liturgy of the word at Mass.” An additional factor favouring such services was the increased popularity of ecumenical gatherings especially after 1964. Since ecumenical gatherings could not be at Mass, such “bible services” were utilized instead.
In the revised liturgical books, a reading Sacred Scripture has been added to virtually all the rites, even optional. For example, almost all the major blessings now have one. Similarly, the sacraments which formerly did not have Scripture readings now do – e.g. Sacrament of Reconciliation (though I’ve never been to confession where it is used) and the Sacrament of Confirmation and Marriage outside Mass. The format of the Celebration of the Word of God varies from a single reading (and psalm) or it can be as at Mass (reading, psalm, Gospel).
The Celebration of the Word of God can also be celebrated as a rite/service in itself and is suggested for “vigils of major feasts, on some of the weekdays of Advent and Lent, and on Sundays and days of precept”. This consists of the introductory rites (hymn, greeting, prayer) followed by Scripture, homily, the Our Father blessing, and dismissal (Go in the peace of Christ. Thanks be to God).