Lancaster vs royal house

Lancaster and royal house both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lancaster	Yes	No	No	No
royal house	Yes	No	No	No

As nouns, royal house is a hypernym of Lancaster; that is, royal house is a word with a broader meaning than Lancaster:

Lancaster: the English royal house that reigned from 1399 to 1461; its emblem was a red rose
royal house: royal persons collectively

Other hypernyms of Lancaster include dynasty, royal family, royal line, royalty.

Lancaster (noun)	royal house (noun)
the English royal house that reigned from 1399 to 1461; its emblem was a red rose	royal persons collectively
a city in northwestern England