Here's what rhymes with populationconnection.
connection connexion section collection affection complexion convection confection direction election infection selection correction injection objection perfection erection ejection protection reflection detection inspection rejection intersection projection recollection dissection insurrection resection subjection defection imperfection inflection dejection interconnection disconnection indirection reflexion abjection inflexion interjection bisection refection resurrection deflection disaffection reelection circumspection redirection reinfection trisection introspection predilection disinfection misdirection genuflection retrospection Words that almost rhyme with populationconnection
mention attention conception session tension convention concession confession contention pension reckon cession ascension melon pectin beckon gentian hessian seven heaven perception possession aggression chairman compression dimension invention lesson weapon accession oppression congestion inception lemon lessen obsession resin tendon dentin headman leaden leaven felon headmen heron sexton chevron concretion deaden freshen lepton destine hempen penman pennon redden vegan bellman deafen hellion nelson question exception extension impression intention profession eleven reception succession brethren intestine procession regression retention suppression suspension threaten deception detention recession secession dissension freshman ingestion intercession misconception lengthen pepsin declension henchmen interception henchman penguin selectman headsman indention kelvin pressman gremlin helpline expression depression intervention suggestion prevention rebellion hypertension progression redemption repression digestion exemption condescension decompression digression distension inattention pretension abstention preemption watermelon circumvention preconception reinvention stepson nonaggression repossession subvention discretion apprehension comprehension strengthen contraception transgression distention indigestion dispossession prepossession supervention contravention indiscretion retrogression incomprehension rhododendron delicatessen reprehension misapprehension nonintervention autosuggestion