Impress is a synonym of Seize. Rack is a type of Seize. 
Gather is a synonym of Assemble. Assemble is related to Put. Put is related to Keep. Retain is a type of Keep. 
Impress <--Synonym--> Seize <--IsA-- Rack 
Gather <--Synonym--> Assemble <--RelatedTo--> Put <--RelatedTo--> Keep <--IsA-- Retain 