Alone is related to Leave. Leave is the opposite of Wash. Wash is related to Like. Like is related to Reply. 
Occur is a synonym of Appear. Appear is related to Visible. 
Alone <--RelatedTo--> Leave <--Antonym--> Wash <--RelatedTo--> Like <--RelatedTo--> Reply 
Occur <--Synonym--> Appear <--RelatedTo--> Visible 