Mention is a synonym of Reference. Reference is a synonym of Address. Address is related to Dear. 
Suck is a type of Drink. Soak is etymologically related to Suck. Steep is a type of Soak. Steep is related to Vertical. 
Mention <--Synonym--> Reference <--Synonym--> Address <--RelatedTo--> Dear 
Drink <--IsA-- Suck <--EtymologicallyRelatedTo-- Soak <--IsA-- Steep <--RelatedTo--> Vertical 