in conjunction

accordingly collectively cooperatively in tandem mutually simultaneously together unitedly

conjointly

agreeably alike arm in arm coincidentally combined companionably concomitantly concurrently connectedly en masse hand in glove hand in hand harmoniously in a group in common in company with in concert in league in partnership in unison inextricably inseparably intimately reciprocally side by side similarly synchronically with one another

singly

commonly jointly

reciprocally

all at once as a group by agreement by contract conjointly cooperatively en masse in collaboration in combination respectively

dissimilarly distinctly