Machine is related to Artificial. Artificial is the opposite of Real. Real is related to Particular. Particular is similar to Specific. 
Employ is related to Working. Working is a synonym of Functional. 
Machine <--RelatedTo--> Artificial <--Antonym--> Real <--RelatedTo--> Particular <--SimilarTo--> Specific 
Employ <--RelatedTo--> Working <--Synonym--> Functional 