Am vs metallic element

Am and metallic element both are nouns.

Word	Noun	Adjective	Verb	Adverb
Am	Yes	No	No	No
metallic element	Yes	No	No	No

As nouns, metallic element is a hypernym of Am; that is, metallic element is a word with a broader meaning than Am:

Am: a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms
metallic element: any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.

Other hypernyms of Am include metal.

Am (noun)	metallic element (noun)
a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms	any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.