Marriage is a type of Union. Marriage is related to Holy. Holy is related to Sacred. Sacred is related to Church. 
Frozen is related to Cold. Virus can cause/lead to Cold. Virus is a type of Species. Species is related to Fish. 
Union <--IsA-- Marriage <--RelatedTo--> Holy <--RelatedTo--> Sacred <--RelatedTo--> Church 
Frozen <--RelatedTo--> Cold <--Causes-- Virus --IsA--> Species <--RelatedTo--> Fish 