ion

• caption, convention, emotion, notion, nation, carnation, ration, fraction, vacation, vocation, location, occupation, corporation, station, vegetation, plantation, foundation, section, ambition, tradition, edition, condition, position, petition, solution, portion, proportion, lotion, potion, commotion, auction, audition
• mansion, passion, compassion, dimension, session, mission, fission, fashion, cushion, complexion
• occasion, television, vision, version, illusion

suffix -ion [ion, tion, sion] (act, process, state):
• question, digestion, suggestion, mention, motion, attention, retention, intention, invention, intervention, prevention, insertion, sanction, action, interaction, reaction, refraction, traction, attraction, distraction, subtraction, contraction, retraction, extraction, transaction, satisfaction, affection, infection, election, selection, reflection, rejection, objection, projection, perfection, protection, detection, direction, correction, connection, collection, recollection, inspection, extinction, distinction, prediction, conviction, friction, restriction, production, introduction, induction, decoction, concoction, construction, instruction, destruction, obstruction, suction, function, conjunction, deduction, deletion, completion, discretion, exhibition, expedition, rendition, addition, definition, recognition, premonition, ignition, cognition, transition, composition, disposition, deposition, supposition, acquisition, partition, repetition, competition, superstition, intuition, nutrition, exception, reception, perception, conception, encryption, description, prescription, subscription, option, adoption, reduction, assumption, consumption, eruption, corruption, disruption, interruption, transcription, pollution, evolution, resolution, revolution, execution, institution, substitution, constitution, contribution, distribution, caution, precaution, promotion, devotion, distortion, education, medication, application, classification, clarification, gratification, ramification, specification, complication, communication, identification, verification, qualification, indication, implication, certification, modification, notification, publication, multiplication, duplication, reciprocation, validation, recommendation, navigation, allegation, delegation, investigation, obligation, congregation, aviation, variation, retaliation, abbreviation, appreciation, reconciliation, pronunciation, humiliation, association, dissociation, disassociation, negotiation, relation, translation, calculation, cancellation, circulation, inflation, installation, regulation, revelation, ventilation, legislation, speculation, manipulation, simulation, accumulation, isolation, violation, population, congratulation, consolation, constellation, contemplation, compilation, correlation, animation, inflammation, information, confirmation, affirmation, estimation, exclamation, imagination, inclination, donation, coordination, destination, determination, explanation, fascination, illumination, nomination, termination, combination, reincarnation, rejuvenation, procrastination, anticipation, participation, narration, admiration, decoration, desperation, separation, moderation, operation, cooperation, collaboration, consideration, declaration, celebration, integration, vibration, evaporation, exaggeration, expiration, inspiration, perspiration, desperation, adoration, restoration, exploration, deterioration, configuration, duration, alteration, illustration, registration, administration, demonstration, frustration, concentration, sensation, conversation, compensation, confrontation, consultation, computation, salutation, hesitation, expectation, meditation, reputation, temptation, presentation, representation, misrepresentation, invitation, visitation, limitation, interpretation, documentation, fermentation, permutation, notation, annotation, connotation, quotation, rotation, transportation, activation, elevation, innovation, renovation, reservation, conservation, observation, motivation, realization, civilization, authorization, organization, specialization, radiation, graduation, creation, recreation, situation, evaluation, fluctuation, punctuation
• session, tension, extension, expression, depression, impression, profession, procession, possession, progression, compulsion, compression, comprehension, apprehension, recession, concession, confession, suspension, emission, admission, submission, commission, permission, percussion, concussion, discussion, suspicion
• invasion, persuasion, collision, decision, incision, precision, vision, division, revision, provision, adhesion, diversion, conversion, aversion, explosion, fusion, infusion, profusion, transfusion, confusion, conclusion, delusion, intrusion, [equation]

ion 名詞字尾: -tion, -sion, -ssion