numeral vs no.

numeral and no. both are nouns.

Word	Noun	Adjective	Verb	Adverb
numeral	Yes	Yes	No	No
no.	Yes	No	No	No

As nouns, no. is a hyponym of numeral; that is, no. is a word with a more specific, narrower meaning than numeral:

Other hyponyms of numeral include ordinal, ordinal number, indefinite numeral, cardinal number, cardinal numeral.

numeral (noun)	no. (noun)
a symbol used to represent a number	the number designating place in an ordered sequence
a word expressing a number.

numeral (adjective)	no. (adjective)
of or relating to or denoting numbers