The apostle Paul addressed his fellow-laborers as synergos (pronounced "soon'-er-gös"), a Greek word he coined for the purpose —and from which we derive our English words, synergy and synergism.

synergism (siner jizem)n.
  1. the simultaneous action of separate agencies which, together, have greater total effect than the sum of their individual effects
  2. the combined or correlated action of different organs or parts of the body, as of muscles working together

"...my brother, fellow worker and fellow soldier..."     
Philippians 2:25

"... you yourselves like living stones are being built up as a spiritual house, to be a holy priesthood, to offer spiritual sacrifices acceptable to God through Jesus Christ."

1Peter 2:5

"...We teach everyone we can all that we know about Him, so that, if possible, we may bring every man up to his full maturity in Christ Jesus."

Colossians 1:28 (adapted from Phillips)