Answer:

interact

Answer	Crossword Clue
INTERACT	Participate in group therapy, perhaps
INTERACT	Work together
INTERACT	Create synergy, perhaps

INTERACT	Converse
INTERACT	Converse (with)
INTERACT	Produce an effect upon each other.
INTERACT	Have reciprocal effect
INTERACT	Affect mutually
INTERACT	Relate
INTERACT	Influence reciprocally
INTERACT	Combine

INTERACT	Communicate
INTERACT	Be sociable