Tomato is related to Stem. Stem is related to Tree. Tree is related to Present. Present is related to Feed. 
Vacation can be used for Relax. Vacation is related to Time. Time is a type of Attribute. 
Tomato <--RelatedTo--> Stem <--RelatedTo--> Tree <--RelatedTo--> Present <--RelatedTo--> Feed 
Relax <--UsedFor-- Vacation <--RelatedTo--> Time --IsA--> Attribute 