The answer depends on the font and whether you use upper case or lower case.
MOW, SIS
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It has rotational symmetry to the order of 2
No. The words 'mom' & 'noon' have reflectionalsymmetry - but the words 'hook and 'bib' have no symmetry at all.
A regular nonagon with 9 sides has a rotational symmetry of 9.
Rotational symmetry of order 1.
A line has 180 degrees rotational symmetry.