Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
faenĭcŭlum (fēn-, foen-), i, n. [faenum, II.], fennel, Plin. 20, 23, 95, § 254; Pall. Febr. 24, 9.
fēnĭcŭlum, v. faeniculum.