As a noun sanna
is a spongy steamed rice cake, popular in parts of india.
As a proper noun senna is
Other Comparisons: What's the difference?
A spongy steamed rice cake, popular in parts of India.
(countable) Any of several plants of the tribe Cassieae, especially those of the genera Cassia'' and ''Senna , whose leaves and pods are used as a purgative and laxative.
(uncountable) The dried leaves or pods of these plants (especially of ) used medicinally.
* bladder senna