atomic number 39 vs yttrium

atomic number 39 and yttrium both are nouns.

Word	Noun	Adjective	Verb	Adverb
atomic number 39	Yes	No	No	No
yttrium	Yes	No	No	No

As nouns, atomic number 39 and yttrium are synonyms defined as:

atomic number 39 and yttrium: a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys

Other synonyms of atomic number 39 include Y.

atomic number 39 (noun)	yttrium (noun)
a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys	a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys