Pop is a type of Sound. Sound is related to Similar. Similar is related to Brush. you are likely to find Hair in/at/on Brush. 
Unity is related to Nation. Nation is related to Term. Term is related to Vacation. 
Pop --IsA--> Sound <--RelatedTo--> Similar <--RelatedTo--> Brush <--AtLocation-- Hair 
Unity <--RelatedTo--> Nation <--RelatedTo--> Term <--RelatedTo--> Vacation 