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The complex , nonequilibrium physical , chemical , and metallurgical nature of additive manufacturing ( AM ) tends to lead to uncontrollable and unpredictable material and structural properties .
 metallurgical, additive manufacturing, AM, lead, material, properties
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 metallurgical, additive manufacturing, AM, lead, material, properties