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Integration of metal additive manufacturing ( AM ) and cold spray ( CS ) technologies provide an unprecedented opportunity to manufacture coated material systems with complex geometrical features .
 metal additive manufacturing, AM, technologies, manufacture, coated, geometrical features
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:
 metal additive manufacturing, AM, technologies, manufacture, coated, geometrical features