The Japanese word for "wasabi" is pronounced "wasabi"
Wasabi is made from a plant called wasabi (wasabi), whereas karashi is made from a plant called karashina (mustard). This is the essential difference.
In terms of usage, according to the authentic Japanese way of eating, wassabi is used when eating sushi and sashimi, while karashi is used when eating things like oden, kanto boiled.
They're not the same thing at all, but for some reason they're both translated as wasabi.
Wasabi and Karashi are both wasabi, but wasabi is green and spicier, which is what most of the country has. Karashi is yellow and has a slightly sweet flavor.
Extended information:
The Wasabi Saying in Japan:
Japanese Wasabi is actually a plant called Wasabi. Wasabi looks a bit like humento, but it's green. Wasabi is made by grinding the root of the wasabi on a very, very fine scouring pad, and then grinding it out. It is relatively fresh and can be eaten directly. The flavor of wasabi is mainly due to the reaction of some elements in wasabi in the air, so the flavor of wasabi can only really come out through grinding.
So the wasabi you see is ground, not chopped directly with a kitchen knife like dumpling filling, but in China, we have a variety of wasabi called green wasabi, yellow wasabi, horseradish. But in Japan, everyone eats wasabi, and there's no such thing as horseradish as they say in the news.
The above has been said Japanese wasabi, the following is often seen in the country yellow mustard and horseradish yellow wasabi, in fact, this is a real wasabi, because its main ingredient is a lot of places in the country is used to pickle salty algae mustard seeds, together with other raw materials to make, so it is called wasabi, more worthy of the name, so meet the Japanese wazabi, the flavor is a little stronger (say), and the taste is not as strong as the Japanese wasabi. It has a stronger flavor than Japanese Wassabi (to put it bluntly, it is ha). And mustard in the northeast of China. North China have more comprehensive cultivation, so relatively speaking, the price is cheaper.
We are familiar with the Quanjude three dishes inside the mustard duck palm is the use of this yellow mustard (Quanjude three dishes, branded duck, mustard duck palm, fire prairie duck heart) horseradish, horseradish is the main ingredient is another kind of plant, the feeling looks very much like the eustoma, mainly produced in Europe. Simply check out, the name seems to be called the Western Wasabi a plant.