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Additive Manufacturing ( AM ) is the umbrella term for manufacturing processes that add materials layer by layer to create parts .
 manufacturing process: Additive Manufacturing; manufacturing process: AM; manufacturing process: manufacturing processes; concept or principle: materials; concept or principle: layer by layer
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 manufacturing process: Additive Manufacturing; manufacturing process: AM; manufacturing process: manufacturing processes; concept or principle: materials; concept or principle: layer by layer