Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
muscĭpŭla, ae, f., and muscĭpŭ-lum, i, n. [mus-capio], a mouse-trap: muscipulum, μυάγρα, Gloss. Philox.; Lucil. ap. Non. 266, 2: qui saepe laqueos, et muscipula effugerat, Phaedr. 4, 1, 8 verendum est, ne quando in muscipulā syllabas capiam, Sen. Ep. 48.