A ḥadīth in which a narrator has been replaced with another, whether one narrator, several, or even the entire chain, is al-maqlūb (literally, that which has been inverted).
When the disagreement is the addition of a narrator within the chain, and the one who did not include the addition is more proficient, the report is al-mazīd fī muttaṣil al-asānīd.
When a single narrator takes a ḥadīth in solitary fashion from a prominent imām, it is called gharīb (literally, strange, or one who is alone).
If the narrators of a ḥadīth agree in their wording of transmission, in any verbal feature, in an action, or in some shared quality, this is al-musalsal (literally, a chained or serial ḥadīth).
