adoptive
advocate
agent
alter ego
alternate
alternative
amicus curiae
analogy
attorney
backup
backup man
champion
change
changeling
comparison
copy
counterfeit
delegate
deputize
deputy
double
dummy
equal
equivalent
ersatz
exchange
executive officer
exponent
fake
father figure
father image
figurehead
fill-in
foster
ghost
ghostwriter
imitation
lieutenant
locum
locum tenens
makeshift
metaphor
metonymy
mother figure
mother surrogate
next best thing
paranymph
personnel
phony
pinch hitter
surrogate mother
relief
reliever
stand-in
substitute
surrogated
surrogates
surrogating
dear
long-lost
my
stay-at-home
unwed
your