Uppercase vs. Alphanumeric: What's the Difference?

Uppercase and Alphanumeric Definitions
Uppercase
Of, printed, or formatted in capital letters
An uppercase A.
Uppercase titles.
Alphanumeric
Consisting of both letters and numbers.
Uppercase
To put (type or text) in uppercase letters.
Alphanumeric
Consisting of or using letters, numbers, punctuation marks, and mathematical and other conventional symbols
An alphanumeric code.
Uppercase
To begin (a word) with an uppercase letter.
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Alphanumeric
Consisting of, or limited to, letters and/or numbers, especially the characters A to Z (lowercase and uppercase) and 0 to 9.
Uppercase
Written in upper case; capital
Alphanumeric
Consisting of these characters plus punctuation and other special characters.
Uppercase
Alternative spelling of upper case
Alphanumeric
An alphanumeric character.
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Uppercase
(transitive) To convert (text) to upper case.
Alphanumeric
Of or pertaining to alphanumeric characters
Uppercase
Relating to capital letters which were kept in the top half of a compositor's type case;
Uppercase letters; X and Y and Z etc