appearance vs 3D

appearance and 3D both are nouns.

Word	Noun	Adjective	Verb	Adverb
appearance	Yes	No	No	No
3D	Yes	No	No	No

As nouns, 3D is a hyponym of appearance; that is, 3D is a word with a more specific, narrower meaning than appearance:

Other hyponyms of appearance include illusion, semblance, 3-D, three-D, front.

appearance (noun)	3D (noun)
the act of appearing in public view	having a three-dimensional form or appearance
formal attendance (in court or at a hearing) of a party in an action	a movie with images having three dimensional form or appearance
pretending that something is the case in order to make a good impression
outward or visible aspect of a person or thing
a mental representation
the event of coming into sight