coordination
conferring
copresence
middleman
collimation
conniving
intercessor
association
cooperability
cooperation
coexperiencer
convergence
with friends like these who needs enemies
implication
converging
entrustment
interchange
convergency
complacentry
interentanglement
company
companion
intrusion
accompany
entwinement
companionability
accomplice
intercompatibility
intervention
keep company
meeting of minds
concurrence
synanthery
involvement
assuaging
conspirant
entrapment
collaborate
inseparability
accession
reinvolvement
separator
congruency
interlacement
cofacilitator
consanguinuity
incenser
aggressor
move in on
reunition