Early is the opposite of Later. Later is related to Note. Note is a type of Air. you are likely to find Air in/at/on Bus. 
Tap is related to Nose. Person have Nose. Immune is a type of Person. Immune is the opposite of Vulnerable. 
Early <--Antonym--> Later <--RelatedTo--> Note --IsA--> Air --AtLocation--> Bus 
Tap <--RelatedTo--> Nose <--HasA-- Person <--IsA-- Immune <--Antonym--> Vulnerable 