LekhoriLekhoriA substitute; something that substitutes for another.
Each substituend SN, it seems, would amount to the same thing as its corresponding UN in SOME not very strained context.
A substituendum; something to be substituted or replaced.
[…]but since the substitute y is not treated like the substituend vowel, the option will not prevail.
Borrowed from Latin substituendus; compare substituendum.
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