element 108 vs chemical element

element 108 and chemical element both are nouns.

Word	Noun	Adjective	Verb	Adverb
element 108	Yes	No	No	No
chemical element	Yes	No	No	No

As nouns, chemical element is a hypernym of element 108; that is, chemical element is a word with a broader meaning than element 108:

element 108: a radioactive transuranic element, with atomic number 108
chemical element: any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

Other hypernyms of element 108 include element, iron group element.

element 108 (noun)	chemical element (noun)
a radioactive transuranic element, with atomic number 108	any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter