None vs Noon

Why is the word “none” written as “n-u-n” in Anniversary and  Pre-anniversary dictionaries and in 5000 Must Used Shorthand Forms.  In compound words “none” is always written “n-o-n”, so I would think that for consistency, as well as to differentiate from “noon”, none should always be written “n-o-n”.  A snapshot from the dictionary appears below.  Carlos and others, please comment.

Shaleto.


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