Nomination is a type of Appointment. Appointment is related to Meeting. Meeting is related to Introduce. Introduce is related to Action. 
Shell is related to Sea. Sea is related to Sail. Sail is a type of Boat. 
Nomination --IsA--> Appointment <--RelatedTo--> Meeting <--RelatedTo--> Introduce <--RelatedTo--> Action 
Shell <--RelatedTo--> Sea <--RelatedTo--> Sail --IsA--> Boat 