Here's what rhymes with retardation.
nation station rotation alteration toleration deportation aeration palpation operation relation creation formation corporation duration location occupation radiation adaptation liberation salvation taxation agitation irritation notation plantation temptation dilatation importation mutation ordination probation retaliation starvation aberration adoration alternation citation damnation donation gestation iteration oration reparation sedation ablation dictation dilation elation flotation gradation education population situation generation foundation legislation preparation reputation separation variation admiration correlation declaration deviation elevation limitation obligation orientation realization restoration allocation arbitration aspiration collaboration decoration deformation degradation delegation dissertation domination imitation irrigation meditation oxidation quotation regeneration relaxation respiration saturation termination utilization vacation valuation vegetation vibration affiliation approbation aviation causation cessation deliberation derivation desperation dissipation elaboration federation filtration graduation habitation irradiation litigation maturation mediation moderation narration negation oscillation validation vocation allegation appellation automation castration connotation coronation demarcation deputation devastation elongation exaltation exhortation exportation hydration perforation perspiration perturbation recitation stagnation summation ulceration usurpation utilisation application combination association cooperation integration observation participation presentation publication translation activation appreciation cultivation illustration immigration indication inflation innovation inspiration invitation isolation migration motivation revelation sensation violation accommodation alienation appropriation celebration computation consultation coordination designation destination estimation excitation fixation frustration hesitation incorporation medication nomination penetration proclamation propagation recreation registration rehabilitation reservation resignation accusation affirmation aggregation animation annihilation attenuation authorization calibration compilation dedication deprivation desolation dislocation distillation emigration evaporation expiration fermentation globalization incarnation incubation ionization localization mobilization modulation polarization preoccupation ratification realisation reformation replication subordination veneration abbreviation adjudication affectation amputation augmentation bifurcation commendation dehydration delineation divination elucidation emulation eradication fertilization fluctuation germination gravitation implantation imputation inauguration inhalation innervation intimation intonation liquidation masturbation ovulation prolongation provocation punctuation refutation regurgitation relocation renovation repudiation revocation sanitation urbanization visitation information organization consideration interpretation circulation civilization conversation evaluation imagination regulation representation compensation conservation demonstration expectation exploitation exploration formulation modification organisation preservation stimulation transportation acceleration anticipation assimilation condemnation confirmation confrontation congregation consolidation contemplation degeneration depreciation deterioration documentation elimination illumination implication inclination indignation inflammation initiation installation navigation proliferation recommendation segregation simulation speculation ventilation annexation articulation assassination certification civilisation colonization complication condensation consolation denomination dissociation exaggeration fabrication fascination fragmentation generalization gratification humiliation infiltration insulation liberalization modernization notification optimization socialization specialization stabilization unification amalgamation authentication capitulation conciliation confederation conformation constellation consternation constipation consummation crystallization culmination devaluation dispensation duplication enumeration escalation fibrillation inoculation interpolation interrogation intimidation invocation mortification ornamentation polymerization reclamation refrigeration resuscitation sedimentation segmentation sterilization stipulation subjugation vaccination vindication communication concentration explanation classification determination accumulation calculation configuration differentiation implementation justification approximation characterization contamination continuation emancipation manifestation manipulation negotiation precipitation qualification reconciliation amplification clarification coagulation dissemination evacuation excavation intoxication multiplication privatization purification remuneration reorganization sophistication stratification transplantation verification argumentation cancellation capitalization categorization centralization confiscation conflagration consecration democratization denunciation deregulation exclamation hybridization immunization inactivation menstruation normalization rationalization renunciation standardization supplementation visualization administration examination identification investigation transformation discrimination specification disintegration pronunciation signification calcification diversification extermination hospitalization instrumentation magnetization magnification nationalization personification quantification simplification experimentation decentralization intensification synchronization industrialization conceptualization excommunication misrepresentation Words that almost rhyme with retardation
basin haven hasten occasion persuasion evasion equation invasion taken pagan bacon patron shaken laden maiden layman laymen shaman awaken contagion forsaken straighten mistaken undertaken statesman salesman overtaken tradesmen