Welcome is related to Sign. Endorse is a type of Sign. Endorse is a synonym of Second. Second is a synonym of Other. 
Lack is the opposite of Possess. Possess is related to Mine. Mine can be used for Destroy. 
Welcome <--RelatedTo--> Sign <--IsA-- Endorse <--Synonym--> Second <--Synonym--> Other 
Lack <--Antonym--> Possess <--RelatedTo--> Mine --UsedFor--> Destroy 