Regard is related to Respect. Respect is the opposite of Being. 
Previous is the opposite of Later. Later is related to Old. Old is related to Description. Description is related to Sound. 
Regard <--RelatedTo--> Respect <--Antonym--> Being 
Previous <--Antonym--> Later <--RelatedTo--> Old <--RelatedTo--> Description <--RelatedTo--> Sound 