Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† ascŏpēra, ae, f., = ἀσκοπήρα, a leathern bag or sack, Suet. Ner. 45: Imposuit abrae suae ascoperam vini, * Vulg. Judith, 10, 5.