Sisoo or Sissoo: How To spell?
The word Sisoo is misspelled against Sissoo, a noun meaning "A leguminous tree (Dalbergia Sissoo) of the northern parts of India; also, the dark brown compact and durable timber obtained from it. It is used in shipbuilding and for gun carriages, railway ties, etc."
Sissoo has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings si & oo which should not be misspelled with single 'S'
Wrong Spelling:  si-s-oo  Correct Spelling:  si-ss-oo 
Find more incorrect spellings of Sissoo to spell right way.