parergon n. a secondary, derivative, unnecessary, or supplemental occupation, ornament, or (creative) work. Also adj., attrib. Editorial Note: Plural parerga. (source: Double-Tongued Dictionary)
Further reading
The owner of a Berlin, Maryland, produce stand wants to know: When a customer is buying four ears of corn, should they say I have four corn or I have four ears of corn? Corn is a mass noun that can also be counted as a plural, just as we might say I...
A librarian opens a book and finds a mysterious invitation scribbled on the back of a business card. Another discovers a child’s letter to the Tooth Fairy, tucked into a book decades ago. What stories are left untold by these forgotten...