armillary sphere vs armilla

armillary sphere and armilla both are nouns.

Word	Noun	Adjective	Verb	Adverb
armillary sphere	Yes	No	No	No
armilla	Yes	No	No	No

As nouns, armillary sphere and armilla are synonyms defined as:

armillary sphere and armilla: a celestial globe consisting of metal hoops; used by early astronomers to determine the positions of stars

armillary sphere (noun)	armilla (noun)
a celestial globe consisting of metal hoops; used by early astronomers to determine the positions of stars	(archeology) a bracelet worn around the wrist or arm
	a celestial globe consisting of metal hoops; used by early astronomers to determine the positions of stars