Dy vs atomic number 66

Dy and atomic number 66 both are nouns.

Word	Noun	Adjective	Verb	Adverb
Dy	Yes	No	No	No
atomic number 66	Yes	No	No	No

As nouns, Dy and atomic number 66 are synonyms defined as:

Dy and atomic number 66: a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic

Other synonyms of Dy include dysprosium.

Dy (noun)	atomic number 66 (noun)
a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic	a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic