Lower is a type of Move. Lower is related to Pass. Pass is the opposite of Take. Take is a synonym of Undergo. 
Rifle is a synonym of Fish. Fish is related to Fisherman. 
Move <--IsA-- Lower <--RelatedTo--> Pass <--Antonym--> Take <--Synonym--> Undergo 
Rifle <--Synonym--> Fish <--RelatedTo--> Fisherman 