Pt vs atomic number 78

Pt and atomic number 78 both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pt	Yes	No	No	No
atomic number 78	Yes	No	No	No

As nouns, Pt and atomic number 78 are synonyms defined as:

Pt and atomic number 78: a heavy precious metallic element; grey-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits

Other synonyms of Pt include platinum.

Pt (noun)	atomic number 78 (noun)
a heavy precious metallic element; grey-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits	a heavy precious metallic element; grey-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits