What is a Stable Word™?

_{This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles.}

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If a word conforms to a special rule, I call it a Stable Word™.

Use the following examples below to find the rule.

And, if you want to analyze, here is a CSV version:

Stable words™,Non-Stable words™
even,odd
acidic,alkaline
transparent,opaque
uniqueness,repetition
movableness,mobility
concoction,mixture
explode,implode
trademark,protected
Chinese,Japanese
rare,common
cyclic,acyclic
dared,Scandinavianism
Aaronsburg,Canada
alternate,algorithm

The puzzle relies on the series’ inbuilt assumption, that each word can be tested for whether it is a Stable Word™ without relying on the other words.

These are not the only examples of Stable Words™, many more exist and can be found.

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Hint #1

Hint #2