The Flute does not use a reed.
To make a sound, you blow across the hole in the mouthpiece, kind of like if you have ever blown across the top of a bottle to make a sound.
To change the sound, you press down on the keys.
The Flute sounds high.
Mouthpiece with single reed
The Clarinet uses a single reed on the mouthpiece.
To make a sound, you blow into the mouthpiece.
You change notes by pressing different keys.
Double reed
The Oboe uses a Double Reed as the mouthpiece.
A double reed is 2 pieces of wood pressed together, and you blow between them.
The Oboe is the highest Double Reed Woodwind.
The Bassoon is large. It is folded in half, but if unfolded, it would be 8 feet 4 inches long.
It uses a Double Reed.
It sounds low.
The Bassoon is sometimes called "the clown of the orchestra".