three-dimensional vs three-d

three-dimensional and three-d both are adjectives.

Word	Noun	Adjective	Verb	Adverb
three-dimensional	No	Yes	No	No
three-d	No	Yes	No	No

As adjectives, three-dimensional and three-d are synonyms defined as:

three-dimensional and three-d: involving or relating to three dimensions or aspects; giving the illusion of depth

Other synonyms of three-dimensional include 3-dimensional, third-dimensional.

three-dimensional (adjective)	three-d (adjective)
having the shape of a cube; having three dimensions	involving or relating to three dimensions or aspects; giving the illusion of depth
involving or relating to three dimensions or aspects; giving the illusion of depth