Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
gŭbernātrix, īcis, f. [gubernator, II.], a conductress, directress: an fortunam collaudem, quae gubernatrix fuit? Ter. Eun. 5, 9, 16: ista praeclara gubernatrice civitatum eloquentia rem publicam dissipaverunt, Cic. de Or. 1, 9, 38.