Public is related to Sign. Initial is a type of Sign. Initial is a synonym of Opening. 
Wet is related to Ocean. Ocean is related to Small. Small is related to Flower. Flower is part of Bush. 
Public <--RelatedTo--> Sign <--IsA-- Initial <--Synonym--> Opening 
Wet <--RelatedTo--> Ocean <--RelatedTo--> Small <--RelatedTo--> Flower --PartOf--> Bush 