Missile is related to Space. Space is related to Earth. Earth is related to Plant. Plant is a type of Actor. 
Exercise is a synonym of Use. Use is related to Time. Time is related to Work. Specialize is a type of Work. 
Missile <--RelatedTo--> Space <--RelatedTo--> Earth <--RelatedTo--> Plant --IsA--> Actor 
Exercise <--Synonym--> Use <--RelatedTo--> Time <--RelatedTo--> Work <--IsA-- Specialize 