How to spell YSTER correctly?

There are a few possible correct suggestions for the misspelling "yster". It could be "ysteria" which refers to mass hysteria or a state of extreme fear or excitement. Another possible suggestion could be "oyster", the popular shellfish. Lastly, it could be a misspelling of "Easter", the Christian holiday.

• Aster The garden was filled with colorful beautiful asters.
• Ester I am learning about the chemical properties of Ester in my chemistry class.
• Oyster She ordered a dozen fresh oysters from the raw bar.

Ciaou

• chaos
• char
• chou
• chow
• cia
• ciao
• iou
• tia