Depart is the opposite of Board. Board is related to Mechanism. Mechanism is related to Band. 
Begin is a type of Act. Act is related to Cut. Cut is related to Edge. Edge is related to Thin. 
Depart <--Antonym--> Board <--RelatedTo--> Mechanism <--RelatedTo--> Band 
Begin --IsA--> Act <--RelatedTo--> Cut <--RelatedTo--> Edge <--RelatedTo--> Thin 