crossbones vs symbol

crossbones and symbol both are nouns.

Word	Noun	Adjective	Verb	Adverb
crossbones	Yes	No	No	No
symbol	Yes	No	No	No

As nouns, symbol is a hypernym of crossbones; that is, symbol is a word with a broader meaning than crossbones:

crossbones: two crossed bones (or a representation of two crossed bones) used as a symbol danger or death
symbol: something visible that by association or convention represents something else that is invisible

Other hypernyms of crossbones include symbolic representation, symbolisation, symbolization.

crossbones (noun)	symbol (noun)
two crossed bones (or a representation of two crossed bones) used as a symbol danger or death	something visible that by association or convention represents something else that is invisible
	an arbitrary sign (written or printed) that has acquired a conventional significance