Welcome is related to Response. Response is a different concept from Reply. Reply is related to Deny. Deny is related to Forbid. 
Explain is related to Clear. Clear is related to Distinct. Distinct is a synonym of Apparent. 
Welcome <--RelatedTo--> Response <--DistinctFrom--> Reply <--RelatedTo--> Deny <--RelatedTo--> Forbid 
Explain <--RelatedTo--> Clear <--RelatedTo--> Distinct <--Synonym--> Apparent 