Suspicious is a synonym of Suspect. Suspect is a type of Think. Pretend requires Think. 
Key is related to Item. Item is related to Cloud. Cloud is related to Related. Related is related to Birthday. 
Suspicious <--Synonym--> Suspect --IsA--> Think <--HasPrerequisite-- Pretend 
Key <--RelatedTo--> Item <--RelatedTo--> Cloud <--RelatedTo--> Related <--RelatedTo--> Birthday 