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The accuracy of various AM techniques are different since different laser spot size , powder layer thickness , procesB-parameters as well as powder material are used .
 process characterization: accuracy; manufacturing process: AM techniques; process parameter: laser spot size; material: powder; process parameter: layer thickness; material: as; material: as; material: material
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:
 process characterization: accuracy; manufacturing process: AM techniques; process parameter: laser spot size; material: powder; process parameter: layer thickness; material: as; material: as; material: material