Why can't I combine Warrior and Ship to get a Pirate?

Is it a game or merely a pass-time? The puzzle game DoodleGod presents an interesting dilemma.

First of all, it has nothing to do with Doodling. And you aren't really God in it - more like an Alchemist. And yet DoodleGod is fun and very addicting. Think of it as a simple (and free) Scribblenauts where logic plays a bigger part in solving the puzzle.

The goal is start with the four elements (Fire, Water, Earth and Wind) and create natural and technological advancements by combining them together two at a time. What makes this work is the great graphics and presentation.

It's not a bad way to kill a couple (or several hours)