orb vs eyeball

orb and eyeball both are nouns.

Word	Noun	Adjective	Verb	Adverb
orb	Yes	No	Yes	No
eyeball	Yes	No	Yes	No

As nouns, orb and eyeball are synonyms defined as:

orb (noun)	eyeball (noun)
the ball-shaped capsule containing the vertebrate eye	the ball-shaped capsule containing the vertebrate eye
an object with a spherical shape

orb (verb)	eyeball (verb)
move in an orbit	look at