Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
consŏnantĭa, ae, f. [consono], an agreement, harmony, consonance (postAug. and rare): vocis, Vitr. 5, 5, 7: vocum proximarum, Gell. 13, 20, 5: scripturarum, Tert. adv. Jud. 11 and 14.