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Among the main areas of AM application stands out : - Aerospace : AM technology is particularly suitable to obtain a limited number of pieces that are usually required for aerospace applications , with complex geometries and made of advanced materials which are difficult , costly and time-consuming to manufacture .
 process parameter: areas; manufacturing process: AM; application: Aerospace; manufacturing process: AM technology; application: aerospace; concept or principle: complex geometries; concept or principle: materials; concept or principle: manufacture
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 parameter: areas; manufacturing process: AM; application: Aerospace; manufacturing process: AM technology; application: aerospace; concept or principle: complex geometries; concept or principle: materials; concept or principle: manufacture