long-beard vs greybeard

long-beard and greybeard both are nouns.

Word	Noun	Adjective	Verb	Adverb
long-beard	Yes	No	No	No
greybeard	Yes	No	No	No

As nouns, long-beard and greybeard are synonyms defined as:

long-beard and greybeard: a stoneware drinking jug with a long neck; decorated with a caricature of Cardinal Bellarmine (17th century)

Other synonyms of long-beard include bellarmine, longbeard.

long-beard (noun)	greybeard (noun)
a stoneware drinking jug with a long neck; decorated with a caricature of Cardinal Bellarmine (17th century)	a stoneware drinking jug with a long neck; decorated with a caricature of Cardinal Bellarmine (17th century)
	a man who is very old