You're a small adventurer with an enormous vocabulary, but every word you say is permanently struck from your dictionary.
Speak (or tap) a word to summon what it names: say tree to grow a tree, bridge to lay a bridge, boat to float on water. Use your vocabulary wisely. The same word will not return.
Move with WASD/joystick. Tap a word OR hold the 🎤 SPEAK button to say it out loud.