Hire is a synonym of Engagement. Engagement is related to Propose. Propose is related to Will. Willing is a form of Will. 
Dog can be Black. Dog is related to Hair. Hair is related to Horse. 
Hire <--Synonym--> Engagement <--RelatedTo--> Propose <--RelatedTo--> Will <--FormOf-- Willing 
Black <--HasProperty-- Dog <--RelatedTo--> Hair <--RelatedTo--> Horse 