Tuck is related to Fold. Fold is a type of Integrate. Integrated is a form of Integrate. Integrated is similar to Mixed. 
Gray is related to Fog. Fog is a type of Weather. 
Tuck <--RelatedTo--> Fold --IsA--> Integrate <--FormOf-- Integrated <--SimilarTo--> Mixed 
Gray <--RelatedTo--> Fog --IsA--> Weather 