Fr vs metallic element

Fr and metallic element both are nouns.

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

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

Fr: a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
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 Fr include metal.

Fr (noun)	metallic element (noun)
a radioactive element of the alkali-metal group discovered as a disintegration product of actinium	any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.