Compound is a synonym of Agree. Agree is the opposite of Decline. Decline is related to Protest. 
Tend is a type of Attend. Tend is a synonym of Lean. Lean is related to Trim. Shelter is etymologically related to Trim. 
Compound <--Synonym--> Agree <--Antonym--> Decline <--RelatedTo--> Protest 
Attend <--IsA-- Tend <--Synonym--> Lean <--RelatedTo--> Trim <--EtymologicallyRelatedTo-- Shelter 