Cd vs cadmium

Cd and cadmium both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cd	Yes	No	No	No
cadmium	Yes	No	No	No

As nouns, Cd and cadmium are synonyms defined as:

Cd and cadmium: a soft bluish-white ductile malleable toxic bivalent metallic element; occurs in association with zinc ores

Other synonyms of Cd include atomic number 48.

Cd (noun)	cadmium (noun)
a soft bluish-white ductile malleable toxic bivalent metallic element; occurs in association with zinc ores	a soft bluish-white ductile malleable toxic bivalent metallic element; occurs in association with zinc ores