Drain is part of Toilet. Toilet is a synonym of Pot. Pot is related to Drug. 
you are likely to find Bug in/at/on Rock. Secret can Bug. Secret is related to Crush. Crush is a synonym of Beat. 
Drain --PartOf--> Toilet <--Synonym--> Pot <--RelatedTo--> Drug 
Rock <--AtLocation-- Bug <--CapableOf-- Secret <--RelatedTo--> Crush <--Synonym--> Beat 