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Robust measurement of layer geometry can help better understand the complex deposition process and provide feedback control to increase process stability of wire and arc additive manufacturing ( WAAM ) .
 process characterization: measurement; process parameter: layer; concept or principle: geometry; manufacturing process: deposition process; process parameter: feedback; concept or principle: process; manufacturing process: wire and arc additive manufacturing; manufacturing process: WAAM
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: measurement; process parameter: layer; concept or principle: geometry; manufacturing process: deposition process; process parameter: feedback; concept or principle: process; manufacturing process: wire and arc additive manufacturing; manufacturing process: WAAM