hap

Base information:

• Denotation: "chance, luck, fortune, fate"
• Root: happ
• Root Language: Old Norse
• Type: free
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• Wiktionary Root Page

Word sums:

• Hap + y + ly -> happily
• Hap + en + ing -> happening
• Hap + y + ness -> happiness
• Hap + en -> happen
• Hap + y -> happy