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The advent of additive manufacturing ( AM ) , also often referred to as 3D printing , has enabled the rapid production of parts with complex geometries that are either labor-intensive or unrealizable by traditional manufacturing methods .
 additive manufacturing, AM, as, 3D printing, production, complex geometries, traditional manufacturing
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:
 additive manufacturing, AM, as, 3D printing, production, complex geometries, traditional manufacturing