Direction is related to Command. Command is the opposite of Ask. Ask is related to Answer. Answer is related to Difference. 
Particle is related to Point. Point is related to Top. Cap is a type of Top. Cap is a synonym of Lid. 
Direction <--RelatedTo--> Command <--Antonym--> Ask <--RelatedTo--> Answer <--RelatedTo--> Difference 
Particle <--RelatedTo--> Point <--RelatedTo--> Top <--IsA-- Cap <--Synonym--> Lid 