Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† cappăris, is, f. (acc. -im, Plaut. Curc. 1, 1, 90; Varr. ap. Charis. p. 79 P.; acc. -in, Mart. 3, 77; Cels. 4, 9), and (rare) cappă-ri, indecl. n., = κάππαρις or κάππαρι,