greybeard vs bellarmine

greybeard and bellarmine both are nouns.

Word	Noun	Adjective	Verb	Adverb
greybeard	Yes	No	No	No
bellarmine	Yes	No	No	No

As nouns, greybeard and bellarmine are synonyms defined as:

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

Other synonyms of greybeard include long-beard, longbeard.

greybeard (noun)	bellarmine (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