Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Spŏrădes, um, f., = Σποράδες, islands in the Ægean Sea, between the Cyclades and Crete, Mel. 2, 7, 11; Plin. 4, 12, 23, § 63.
Acc. Sporadas, Prisc. Perieg. 550.