Level is related to Leave. Leave is a synonym of Depart. Depart is the opposite of Arrival. 
Agree is related to Say. Say is related to Nation. Nation is related to Similar. Similar is a different concept from Difference. 
Level <--RelatedTo--> Leave <--Synonym--> Depart <--Antonym--> Arrival 
Agree <--RelatedTo--> Say <--RelatedTo--> Nation <--RelatedTo--> Similar <--DistinctFrom--> Difference 