1. (noun) someone who takes the place of another (as when things get dangerous or difficult)

• backup
• backup man
• fill-in
• relief
• reliever
• substitute

1. (noun) someone who takes the place of another (as when things get dangerous or difficult)

• alternate
• replacement
• surrogate
• double
• stunt man
• stunt woman
• locum
• locum tenens

1. (noun) someone who takes the place of another (as when things get dangerous or difficult)

• compeer
• equal
• match
• peer

1. (noun) someone who takes the place of another (as when things get dangerous or difficult)

• alternate
• alternative
• substitute
• deputise
• deputize
• step in
• substitute
• fill in
• fill in
• fill in
• stand in
• stand in
• stand in
• sub
• sub
• sub
• substitute
• substitute
• substitute
• relieve
• take over