Attempt is a synonym of Aim. Aim is a synonym of End. End is the opposite of Start. 
Month is related to Related. Related is the opposite of Climb. Climb is related to Special. Specialty is derived from Special. 
Attempt <--Synonym--> Aim <--Synonym--> End <--Antonym--> Start 
Month <--RelatedTo--> Related <--Antonym--> Climb <--RelatedTo--> Special <--DerivedFrom-- Specialty 