Button can be used for Pin. Pin is a synonym of Trap. Net is a type of Trap. Net is a synonym of Sack. 
Worried is derived from Worry. Worry is a synonym of Disturb. Disturb is the opposite of Settle. Clear is a type of Settle. 
Button --UsedFor--> Pin <--Synonym--> Trap <--IsA-- Net <--Synonym--> Sack 
Worried --DerivedFrom--> Worry <--Synonym--> Disturb <--Antonym--> Settle <--IsA-- Clear 