Availability is related to Supply. Seat is a type of Supply. Seat is related to Table. you are likely to find Knife in/at/on Table. 
Action is a synonym of Subject. Math is a type of Subject. Math is related to Array. 
Availability <--RelatedTo--> Supply <--IsA-- Seat <--RelatedTo--> Table <--AtLocation-- Knife 
Action <--Synonym--> Subject <--IsA-- Math <--RelatedTo--> Array 