A moonletmoonette is a natural satellite of a moon without being a moon itself. A planet is also a natural satellite of a star. The use of the word “moon” as a common term for natural satellites of planets is well established in professional terminology.
To be fair, we didn’t know there were more until Galileo showed up late to the party with his telescope.
And technically the Moon is the only Moon. The “correct” term for what’s colloquially called “moon” is “natural satellite”.
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moonletmoonette is a natural satellite of a moon without being a moon itself. A planet is also a natural satellite of a star. The use of the word “moon” as a common term for natural satellites of planets is well established in professional terminology.