Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
turbŭla, ae, f. dim. [turba], a disorderly group, a little crowd of people (Appuleian): turbulae complent totas plateas, App. M. 11, p. 260, 16; 11, p. 159, 27; 4, p. 151, 39.