Equal is a synonym of Able. Able is a synonym of Suitable. 
Danger is related to Threat. Threat is a type of Warning. Warning is related to Duck. Duck is related to Bar. 
Equal <--Synonym--> Able <--Synonym--> Suitable 
Danger <--RelatedTo--> Threat --IsA--> Warning <--RelatedTo--> Duck <--RelatedTo--> Bar 