vagrate
six and two threes
mixed
ambidirectional
differing
wherebetween
amphi-
dif
submentalize
bothridial
one-two
equidifferent
bispecificity
better
dual
comparate
in between
pendant
doubly
interdistinguish
ambigenous
interden
bifold
either
intercriteria
two sides of the same coin
distinguishment
both
biconditional
wear two hats
modulo
twi-
binary
duo-
one little duck
shake over
interfactorial
betweenity
contrasted
different
relative
nonidentity
coupla
even
coalternate
twosome
equidifference
varier
miscibility
between
double-handedness
cross-handed
diverse
'tween
deutero-
double
gap
aberrant
intertegular
bicriterion
divergence
on the horns of a dilemma
as the case may be
alteriority
interterm
whatever the case may be
xor
pole
beta
chicken-or-egg question
bet
compare
two-edged
atwix
bistylic
dia-
allo-
relation
betune
para-
tooth
however
slip
apart
obverse
set off
error
up
interrelationship
variation
therebetween
compare and contrast
fine line
latter
ana-
frontofrontal
discern