Walk is a type of Behave. Walk is the opposite of Fly. Fly is related to Become. 
Grow is related to Birthday. Birthday is related to Fellow. Fellow is a synonym of Colleague. 
Behave <--IsA-- Walk <--Antonym--> Fly <--RelatedTo--> Become 
Grow <--RelatedTo--> Birthday <--RelatedTo--> Fellow <--Synonym--> Colleague 