Cottage can be used for Vacation. Vacation is related to General. General is related to Home. Home is related to Big. 
Random is the opposite of Reason. Reason is related to Fault. Fault is related to Line. Line is related to Production. 
Cottage --UsedFor--> Vacation <--RelatedTo--> General <--RelatedTo--> Home <--RelatedTo--> Big 
Random <--Antonym--> Reason <--RelatedTo--> Fault <--RelatedTo--> Line <--RelatedTo--> Production 