How do I get past the obstacles in each level of Osmo Lettertopia?

In order to pass various obstacles, you must spell out a word that describes the obstacle. The word must pass over the square where the obstacle is in order to get past it.

There are 3 different kinds of obstacles in Lettertopia:

1. Guards
2. Traps
3. Doors

When you encounter a new obstacle and correctly spell out a word to describe it, the obstacle will be added to your Creature Database for future reference.