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