Synonyms for Participating:

adj.

all (adjective)
active.

n.

giving (noun)
sharing.
participating (noun)
active, involved.

v.

co-operating (verb)
overlapping, co-operating, Pooling, Associating, intermeshing, Interweaving, meshing, collaborating, reciprocating, Allying, Affiliating, trading, interlacing, Dovetailing, sharing, Colluding, Confederating, intertwining, banding, concurring, uniting.
participating (verb)
Partaking, entering, joining.

Other synonyms:

Other relevant words:
active, involved.