The word does not appear in many dictionaries, and is not a standard genealogical term. The usual spelling appears to be hyphenated as "step-granddaughter" rather than stepgranddaughter (as in stepdaughter and granddaughter) as seen in Wiktionary.
That is the usual spelling of "step-grandfather" but sometimes appears without the hyphen (e.g. Wiktionary). This is not a usual dictionary word, and could be either of two different relationships.
Granddaughter is the correct spelling.
Some example sentences are:
The term is spelled as one word "granddaughter."
The correct spelling is one word, stepdaughter (spouse's daughter from another marriage).
The spelling is great-granddaughter.
The relationship term is usually hyphenated "great-grandchildren" (grandchildren's kids).
You spell it like granddaughter.
granddaughter
Granddaughter
The right spelling is atmosphere.
The correct spelling is entrust.
The correct spelling is woolen.
Harass is the correct spelling.
Kacki
granddaughter or grand-daughter.
The correct spelling is "granddaughter". You could look it up in the dictionary on this site too.
grandaughter
Bubbela is not a Hebrew word. It is a Yiddish word, and it has several spellings. There is no standard way to spell it.
Grandaughter
The right spelling is atmosphere.
Your grandaughter would call your brother her great uncle.
Yeah the right spelling is murderer
That is the correct spelling.
manslaughter
Neptis.
NO! The correct spelling is spinach.