Force is related to Air. Air is related to Reward. Reward is related to Amount. Amount is related to Reduce. 
Participate is etymologically related to Part. Part is related to Hall. Hall is related to Walk. 
Force <--RelatedTo--> Air <--RelatedTo--> Reward <--RelatedTo--> Amount <--RelatedTo--> Reduce 
Participate --EtymologicallyRelatedTo--> Part <--RelatedTo--> Hall <--RelatedTo--> Walk 