Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
carrūcārĭus, a, um, adj. [1. carruca], pertaining to the carruca: mulae, Dig. 21, 1, 38: mulio, Capitol. Max. jun. 4.
Subst.: carrūcārĭus, ĭi, m., a coachman, Dig. 19, 2, 13.