Equipment is related to Machine. Machine is related to Engine. Engine is related to Boat. 
Sorry is a synonym of Unhappy. Unhappy is a synonym of Upset. Upset is a synonym of Disorder. 
Equipment <--RelatedTo--> Machine <--RelatedTo--> Engine <--RelatedTo--> Boat 
Sorry <--Synonym--> Unhappy <--Synonym--> Upset <--Synonym--> Disorder 