Week is related to Quarter. Quarter is related to Head. 
Invitation is related to Envelope. Envelope is related to White. White is related to Blue. Blue is the opposite of Profession. 
Week <--RelatedTo--> Quarter <--RelatedTo--> Head 
Invitation <--RelatedTo--> Envelope <--RelatedTo--> White <--RelatedTo--> Blue <--Antonym--> Profession 