Main Difference
The main difference between Hectagon and Hexagon is that the Hectagon is a polygon with 100 sides and Hexagon is a polygon with six sides.
Hectagon
In geometry, a hectogon or hecatontagon or 100-gon is a hundred-sided polygon. The sum of any hectogon’s interior angles is 17640 degrees.
Hexagon
In geometry, a hexagon (from Greek ἕξ hex, “six” and γωνία, gonía, “corner, angle”) is a six sided polygon or 6-gon. The total of the internal angles of any hexagon is 720°.
Wikipedia
Hectagon (noun)
a polygon with 100 edges, vertices, and angles.
Hectagon (noun)
misspelling of hexagon
Hectagon (noun)
misspelling of heptagon
Hexagon (noun)
A polygon with six sides and six angles.
Wiktionary
Hexagon (noun)
a plane figure with six straight sides and angles.
Oxford Dictionary