Mechanical is related to Automatic. Automatic is the opposite of Manual. Manual is similar to Mouth. Mouth is related to Round. 
Whip is related to Cake. Cake is related to Chef. 
Mechanical <--RelatedTo--> Automatic <--Antonym--> Manual <--SimilarTo--> Mouth <--RelatedTo--> Round 
Whip <--RelatedTo--> Cake <--RelatedTo--> Chef 