Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pulvillus, i, m. dim. [contr. from pulvinulus, from pulvinus], a little cushion, small pillow, Hor. Epod. 8, 16; Front. Ep. ad Ver. 1 Mai; App. M. 10, p. 248, 25.