alphanumerics vs alphanumeric characters

alphanumerics and alphanumeric characters both are nouns.

Word	Noun	Adjective	Verb	Adverb
alphanumerics	Yes	No	No	No
alphanumeric characters	Yes	No	No	No

As nouns, alphanumerics and alphanumeric characters are synonyms defined as:

alphanumerics and alphanumeric characters: a character set that includes letters and digits and punctuation

alphanumerics (noun)	alphanumeric characters (noun)
a character set that includes letters and digits and punctuation	a character set that includes letters and digits and punctuation