molybdenum vs Mo

molybdenum and Mo both are nouns.

Word	Noun	Adjective	Verb	Adverb
molybdenum	Yes	No	No	No
Mo	Yes	No	No	No

As nouns, molybdenum and Mo are synonyms defined as:

molybdenum and Mo: a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel

Other synonyms of molybdenum include atomic number 42.

molybdenum (noun)	Mo (noun)
a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel	a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel