ESP
alternation
answer
coaction
commerce
communication
communion
complementary distribution
concurrence
congress
connection
contact
conversation
converse
cooperation
correspondence
dealing
dealings
engagement
exchange
information
interchange
intercommunication
intercommunion
intercourse
interlacing
intermeshing
interplay
intertwining
interweaving
interworking
linguistic intercourse
mesh
meshing
message
quid pro quo
reply
response
seesaw
social intercourse
speaking
speech
speech circuit
speech situation
talking
telepathy
tit for tat
touch
traffic
truck
analysis
behavior
contribution
coöperation
distribution
environment
evolution
input
integration
interactions
involvement
manipulation
modification
relationship
research
stimulation
transition
abstraction
action
attraction
contraction
diffraction
dissatisfaction
distraction
exaction
extraction
faction
fraction
inaction
infraction
liquefaction
reaction
retraction
satisfaction
subtraction
traction
transaction