Gun is related to Piece. Piece is related to Part. Part is a synonym of Participation. 
Position is related to Start. Start is the opposite of Conclude. Conclude is related to End. Weekend is derived from End. 
Gun <--RelatedTo--> Piece <--RelatedTo--> Part <--Synonym--> Participation 
Position <--RelatedTo--> Start <--Antonym--> Conclude <--RelatedTo--> End <--DerivedFrom-- Weekend 