Be vs metallic element

Be and metallic element both are nouns.

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

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

Be: a light strong brittle grey toxic bivalent metallic element
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 Be include metal.

Be (noun)	metallic element (noun)
a light strong brittle grey toxic bivalent metallic element	any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.