Is kneader a word?

Yes, "kneader" is absolutely a real word.
Although we may not use it frequently in everyday conversation, this word is very common in factories, bakeries, and the machinery industry. We can understand this word in detail from the following aspects:

1. Its literal meaning

This word is composed of the verb "knead" (to knead dough) and the suffix "-er" (a suffix indicating a person or thing).
Just like "work" plus "-er" becomes "worker."
Therefore, the original meaning of kneader is: a person or machine that performs the kneading action.

2. Its role in daily life (referring to people)

In some old-fashioned handmade bakeries or places that value traditional craftsmanship:
Kneader can refer to the master who is specifically responsible for mixing and kneading the dough.
As long as you are repeatedly pushing and folding some sticky substance (such as dough or clay) with your hands, you can be called a kneader at that moment.

3. Its identity in industry (referring to machines)

This is the most common use of this word. In the technical and production fields, kneader specifically refers to a powerful kneading machine.
This machine doesn't simply stir; it repeatedly kneads the materials with huge metal "arms."
Whether it's a factory making rubber, plastic, or adhesives, people will point to that big machine and say, "That's our kneader."

4. Common related vocabulary

To better understand this word, let's look at its "relatives":
Kneading: A gerund, referring to the action or process of "kneading." For example, the "dough kneading process" is called the Kneading process.
Kneadable: An adjective, meaning "capable of being kneaded." For example, some modeling clay will have "kneadable" written on the packaging.
Mixer: This is its "cousin." Although both are called mixers, a kneader is usually more powerful than a regular mixer and is specifically designed for heavy-duty work.

5. The colloquial feel of the language

In an English context, if you say this word to a machine repairman or a baker, they will understand it immediately. It is a very authentic, powerful, and dynamic professional term.