Synonyms of dual
doubleYou use double to indicate that something includes or is made of two things of the same kind.
• a pair of double doors into the room
duplicateDuplicate is used to describe things that have been made as an exact copy of other things, usually in order to serve the same purpose.
• a duplicate copy
twinTwin is used to describe a pair of things that look the same and are close together.
• the twin spires of the cathedral
Thesaurus for dual from the Collins English Thesaurus