Button is etymologically related to Butt. Button is a synonym of Release. Release is related to Cry. Cry is related to Being. 
Pregnancy is related to Test. Test is related to Being. Alien is a type of Being. 
Butt <--EtymologicallyRelatedTo-- Button <--Synonym--> Release <--RelatedTo--> Cry <--RelatedTo--> Being 
Pregnancy <--RelatedTo--> Test <--RelatedTo--> Being <--IsA-- Alien 