Which Latin word has the most spelling variants?

1. What is a spelling variation?
2. What does tempus mean in contemporary?

What is a spelling variation?

Variant spellings occur when a word has more than one accepted spelling. This shouldn't be confused with regional spellings (such as when the British spell “color” as “colour”). Nor is it quite the same as when a word has an old-fashioned, archaic spelling (such as when “jail” was spelled “gaol”).

What does tempus mean in contemporary?

For contemporary (and cotemporary), it's the Latin word tempus (“together in time”).