Lancaster vs Lancastrian line

Lancaster and Lancastrian line both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lancaster	Yes	No	No	No
Lancastrian line	Yes	No	No	No

As nouns, Lancaster and Lancastrian line are synonyms defined as:

Lancaster and Lancastrian line: the English royal house that reigned from 1399 to 1461; its emblem was a red rose

Other synonyms of Lancaster include House of Lancaster.

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