atomic number 44 vs Ru

atomic number 44 and Ru both are nouns.

Word	Noun	Adjective	Verb	Adverb
atomic number 44	Yes	No	No	No
Ru	Yes	No	No	No

As nouns, atomic number 44 and Ru are synonyms defined as:

atomic number 44 and Ru: a rare polyvalent metallic element of the platinum group; it is found associated with platinum

Other synonyms of atomic number 44 include ruthenium.

atomic number 44 (noun)	Ru (noun)
a rare polyvalent metallic element of the platinum group; it is found associated with platinum	a rare polyvalent metallic element of the platinum group; it is found associated with platinum