both
brace
cognate
couple
couplet
derivation
derivative
distich
double harness
duad
duet
duo
dyad
eponym
etymon
match
mates
pair
primitive
root
set of two
span
team
the two
twain
two
twosome
yoke
jacket
bodice
brocade
cape
cassock
cravat
frock
jerkin
kerchief
kilt
pantaloons
sash
slipper
smock
stocking
surcoat
tunic
turban
waistcoat