hand in hand

closeness

State of proximity

• bondingForming close connections
• companionshipState of having company
• togethernessState of close connection

walking · strolling · holding · clasping · intertwined · linked · joined · paired · couple · lovers

collaboration

Joint intellectual work

• teamworkJoint effort toward shared aim
• partnershipShared business arrangement
• allianceFormal union of parties

coordination · joint effort · working together · mutual · shared · collective · combined · reciprocal · cooperation · synergy

interconnected

Joined in multiple ways

• linkedFastened to another
• associatedConnected in relationship
• coupledJoined in pairs

concurrent · simultaneous · coexisting · intertwined · inseparable · correlated · parallel · coinciding · accompanying · corresponding

accord

Harmony between parties

• balanceSteadiness or amount owed
• synchronyTemporal coordination
• alignmentCorrect relative positioning

concert · unison · agreement · compatibility · consonance · rapport · attunement · congruence · cohesion · confluence

• body idiomsheart of gold, heart of stone, cold heart, warm heart, soft heart
• closenessclose by, close contact, close-knit, next door, up close
• harmony phrasesin sync, in tune, on the same page, see eye to eye, in unison
• togethernesstogether, united, unity, togetherness, bonding
• companionshipaccompanied, unaccompanied, together, alone, solo
• unity phrasesall for one, one for all, united we stand, stronger together, all as one