Identifying subject/domain of a given word

My project is to extract keywords from a given text and tell to which domain that keyword belongs to. For example if the keyword is deadlock it should tell the keyword belongs to operating system. I have done till extracting the keywords part. But I am new to machine learning and I need to know "how to tell the domain/subject of that keyword.". Domains include os, networks, dbms... (computer science eng related terms..).

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