numeral vs symbol

numeral and symbol both are nouns.

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

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

numeral: a symbol used to represent a number
symbol: an arbitrary sign (written or printed) that has acquired a conventional significance

numeral (noun)	symbol (noun)
a symbol used to represent a number	something visible that by association or convention represents something else that is invisible
a word expressing a number.	an arbitrary sign (written or printed) that has acquired a conventional significance

numeral (adjective)	symbol (adjective)
of or relating to or denoting numbers