Sandwich is related to Club. Club is a type of Meet. Meet is the opposite of Join. Fair is a type of Join. 
Ignore is the opposite of Stare. Start is etymologically related to Stare. 
Sandwich <--RelatedTo--> Club --IsA--> Meet <--Antonym--> Join <--IsA-- Fair 
Ignore <--Antonym--> Stare <--EtymologicallyRelatedTo-- Start 