In one common usage, musnad refers to a Companion's marfūʿ report transmitted through an apparently connected chain. Al-Khaṭīb al-Baghdādī sometimes extends the designation to a connected mawqūf report, although this is described as uncommon.
Ibn ʿAbd al-Barr uses musnad more broadly in relation to marfūʿ attribution, without insisting on the same continuity criterion in every instance.
The sound interpretive method is to identify a scholar's explicit definition and apply it to that scholar's terminology. A shared technical word need not carry an identical scope in every scholarly context.