Sail is a different concept from Steam. Steam is a different concept from Electric. Electric is related to Motor. 
Strike is a synonym of Fall. Fall is a type of Be. Be is a synonym of Need. 
Sail <--DistinctFrom--> Steam <--DistinctFrom--> Electric <--RelatedTo--> Motor 
Strike <--Synonym--> Fall --IsA--> Be <--Synonym--> Need 