Southwest is derived from South. you are likely to find Slave in/at/on South. 
Vary is a type of Village. Village is related to Country. you are likely to find Lake in/at/on Country. Lake is related to Great. 
Southwest --DerivedFrom--> South <--AtLocation-- Slave 
Vary --IsA--> Village <--RelatedTo--> Country <--AtLocation-- Lake <--RelatedTo--> Great 