royalty vs royal family

royalty and royal family both are nouns.

Word	Noun	Adjective	Verb	Adverb
royalty	Yes	No	No	No
royal family	Yes	No	No	No

As nouns, royalty and royal family are synonyms defined as:

Other synonyms of royalty include royal house, royal line.

royalty (noun)	royal family (noun)
royal persons collectively	royal persons collectively
payment to the holder of a patent or copyright or resource for the right to use their property