atomic number 109 vs Mt

atomic number 109 and Mt both are nouns.

Word	Noun	Adjective	Verb	Adverb
atomic number 109	Yes	No	No	No
Mt	Yes	No	No	No

As nouns, atomic number 109 and Mt are synonyms defined as:

atomic number 109 and Mt: a radioactive transuranic element, with atomic number 109

Other synonyms of atomic number 109 include element 109, meitnerium.

atomic number 109 (noun)	Mt (noun)
a radioactive transuranic element, with atomic number 109	a radioactive transuranic element, with atomic number 109