shadow
go together
inseparability
companionate
inseparably
matelot
two's company, three's a crowd
welding
comrade
mate
bully
made for each other
joined at the hip
companionly
cahoot
cully
face-to-face
weld
shag
hand and glove
compadre
cooperatively
hand in glove
pardner
companionability
coinitiator
companionhood
unseparable
reciprocity
coordinatedly
fellow
associate
companionable
fellowlike
accompliceship
companionableness
undivorceable
indiscerpible
interconnectability
bound up
sib
corresponsive
lonesomely
mateyness
cove
common
interaction
intercomparability
fettler
coexister