Cloud Ladder
A cloud's name is built from two halves: how high it is gives the first half, and its shape gives the second.
A cloud's name is not one word. It is two halves stuck together, and each half answers a different question.
The first half says how high the cloud is. Way up where the air is cold enough to freeze water into ice, the name starts with cirro-. In the middle of the sky it starts with alto-. Down low, closest to the ground, there is no first half at all — a low cloud just wears its shape name.
The second half says what shape it is. A heaped, cotton-ball cloud ends in -cumulus. A flat sheet spread across the sky ends in -stratus.
Put the two together and the name builds itself. High and heaped is a cirrocumulus. Low and heaped is a plain cumulus. Those two clouds are the same shape — the only thing that tells them apart is how far up they are. That is why you cannot name a cloud by looking at its shape alone.
In this game you move one cloud up and down a ladder of sky and choose its shape, and the name assembles in front of you from the two choices you made. It gets harder in three steps: first you copy a name, then you work one out from what the weather is doing, and last you name the same shape twice at two different heights and watch it come out as two different clouds.
Two more names for later: cirrus is the thin wispy one high up, and when a cumulus grows into a towering thunderstorm it becomes a cumulonimbus — nimbus is the part that means rain.