U308 vs chemical compound

U308 and chemical compound both are nouns.

Word	Noun	Adjective	Verb	Adverb
U308	Yes	No	No	No
chemical compound	Yes	No	No	No

As nouns, chemical compound is a hypernym of U308; that is, chemical compound is a word with a broader meaning than U308:

U308: an impure mixture of uranium oxides obtained during the processing of uranium ore
chemical compound: (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight

Other hypernyms of U308 include compound.

U308 (noun)	chemical compound (noun)
an impure mixture of uranium oxides obtained during the processing of uranium ore	(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight