Can you think of words...
with horizontal symmetry?
with vertical symmetry?
with 180 degrees rotation symmetry?
What are the LONGEST words in each category? (Common words are preferred.)
... the longest word with horizontal symmetry is the blood-curdling scream that teen-agers let out in horror movies.
But I can't remember if it has 13 letters as in:
AIAIAIAIAIAIA
or 15 letters as in:
AIAIAIAIAIAIAIA