Disappear is a synonym of Melt. Melt is related to Water. Water is the opposite of Milk. 
Hold is related to Embrace. Embrace is a synonym of Cover. Mask is a type of Cover. 
Disappear <--Synonym--> Melt <--RelatedTo--> Water <--Antonym--> Milk 
Hold <--RelatedTo--> Embrace <--Synonym--> Cover <--IsA-- Mask 