Answer:
Conductus Non-liturgical Latin poems set to simple melodies.
Organum One voice singing a chant melody, accompanied by one or more voices singing the same rhythm.
Gregorian Chant A cappella, monophonic settings of liturgical texts.
Motet Non-liturgical compositions that often featured two singers singing in two different languages.
Step-by-step explanation:
Conductus is a type of sacred, though non-liturgical vocal composition of a metrical Latin text from the 12th or 13th century.
Organum is a chant melody developed in the Middle Ages, that has at least one added voice to enhance the harmony. It can have a supporting bass line singing the same text or the melody can be followed in parallel, or a combination of both can be used.
Gregorian Chant refers to a type of monophonic plainchant, subjected to sacred texts of the Catholic Church which developed in central Europe during the IX and X centuries.
Motet is a polyphonic, mainly vocal musical composition. It became the most important musical genre of the XIII century. It evolved with time by having 3 or 4 voices added, each one interpreting a different text, even in different languages.