Cluster is a synonym of Bunch. Bunch is a synonym of Circle. Circle is related to Wheel. 
Familiar is a synonym of Companion. Companion is related to Fellow. Fellow is related to Happy. you would Smile because Happy. 
Cluster <--Synonym--> Bunch <--Synonym--> Circle <--RelatedTo--> Wheel 
Familiar <--Synonym--> Companion <--RelatedTo--> Fellow <--RelatedTo--> Happy <--MotivatedByGoal-- Smile 