Investigator is a synonym of Detective. Detective is related to Eye. 
Tea is related to Leaf. Leaf is related to Grass. Grass is related to Slope. Slope is related to Feel. 
Investigator <--Synonym--> Detective <--RelatedTo--> Eye 
Tea <--RelatedTo--> Leaf <--RelatedTo--> Grass <--RelatedTo--> Slope <--RelatedTo--> Feel 