Committee can be used for Plan. Planner is derived from Plan. Designer is a type of Planner. 
One is related to Admit. Admit is the opposite of Reject. Reject is the opposite of Claim. 
Committee --UsedFor--> Plan <--DerivedFrom-- Planner <--IsA-- Designer 
One <--RelatedTo--> Admit <--Antonym--> Reject <--Antonym--> Claim 