Appear is a synonym of Known. Known is the opposite of Unknown. Unknown is related to Creature. Creature is related to Monster. 
Birthday is related to Grow. Grow is related to Small. Small is related to Apartment. Apartment is related to Temporary. 
Appear <--Synonym--> Known <--Antonym--> Unknown <--RelatedTo--> Creature <--RelatedTo--> Monster 
Birthday <--RelatedTo--> Grow <--RelatedTo--> Small <--RelatedTo--> Apartment <--RelatedTo--> Temporary 