A word that when rotated (Usually by 180º) it reads the same or another, usually related, word.
Similar to a rotation, where the word doesn't rotate onto itself exactly.
Reflection (Glass Door)
A word written in such a way that if you were to look at it in a mirror it would read the same,
Using the concept of reflection these words are read vertically similar to a totem pole.
Each letter of a spinonym is created using the same shape, rotated or reflected.
These words require no rotation or reflection. They have two meanings depending on how you look at it.