According to "A Sanskrit Primer" (Perry, Edward Delavan; Columbia University Press, 4th edition, 1936) the Sanskrit word for "book" in the sense of "manuscript" appears to be "pustaka", and that for "book" (as a work, rather than as a manuscript) appears to be "grantha". That doesn't appear to be much help, but if your querent has access to a Sanskrit scholar it might be instructive. Peter Ingerman