Piece is a synonym of Bit. Bit is a synonym of Share. Share is a different concept from Keep. Keep is related to Coat. 
Rule can be used for Ruling. Rule can be used for Guide. Guidance is derived from Guide. 
Piece <--Synonym--> Bit <--Synonym--> Share <--DistinctFrom--> Keep <--RelatedTo--> Coat 
Ruling <--UsedFor-- Rule --UsedFor--> Guide <--DerivedFrom-- Guidance 