What is the correct spelling for MOONSELL?

If you meant "moonsell" as a misspelling, there are a few possible correct suggestions. One could be "monosyllable", meaning a word with only one syllable. Another option could be "monosyllabic", referring to something expressed in or characterized by monosyllables. "Moonshell" could also be a correct suggestion, representing a seashell found on the beach.