Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
suāvĭtūdo, ĭnis, f. [suavis], sweetness, pleasantness, agreeableness, delight (very rare for the class. suavitas): cor meum, spes mea, mel meum, suavitudo, cibus, gaudium, my sweet, Plaut. Fragm. ap. Non. 173, 3; id. Stich. 5, 5, 14; Turp. ap. Non. 173, 5 (Com. Fragm. v. 110): pronuntiationis, Auct. Her. 3, 12, 22.
Plur.: suavitudinum mollitie capti, Lact. 6, 22, 5.