Mt vs atomic number 109

Mt and atomic number 109 both are nouns.

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

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

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

Other synonyms of Mt include element 109, meitnerium.

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