Spelling

calendar

It ends in -ar, not -er.

  • calender

    calendar

    Ends in -ar. A calender is a machine for pressing cloth.

The trick

It ends in -AR. A calender is a real but unrelated machine that presses paper and cloth.

Because calender is a real word, spellcheck stays silent and the wrong one ships into scheduling emails forever.

Now go end it in AR.