Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pūnītĭo, ōnis, f. [punio], a punishment (post-class.), Val. Max. 8, 1, 1; Gell. 6, 14, 8; 11, 1, 2; Tert. adv. Nat. 1, 16; Vulg. Sap. 19, 4.