Basketball is related to Guard. Guard is a different concept from Tackle. 
Boom is etymologically related to Beam. Beam is a type of Light. Light is a synonym of Weak. Weak is the opposite of Strong. 
Basketball <--RelatedTo--> Guard <--DistinctFrom--> Tackle 
Boom --EtymologicallyRelatedTo--> Beam --IsA--> Light <--Synonym--> Weak <--Antonym--> Strong 