Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mendīcābŭlum, i, n. [mendico], a beggar, mendicant (ante- and post-class.): hominum mendicabula, Plaut. Aul. 4, 8, 2: circumforaneum, App. M. 9, p. 218, 41.