you are likely to find Rat in/at/on Laboratory. Rat is a type of Hire. Hire is the opposite of Sack. 
Name is related to Crop. Crop is a synonym of Reduce. Reduce is related to Diminish. Diminish is a synonym of Fade. 
Laboratory <--AtLocation-- Rat --IsA--> Hire <--Antonym--> Sack 
Name <--RelatedTo--> Crop <--Synonym--> Reduce <--RelatedTo--> Diminish <--Synonym--> Fade 