ANSWER
words ending in-sion:
abrasion">abrasion">abrasion">abrasion
aggression">aggression">aggression">aggression
admission">admission">admission">admission
session">session">session">session
contusion">contusion">contusion">contusion
causation">causation">causation">causation
compassion">compassion">compassion">compassion
commission">commission">commission">commission
explosion">explosion">explosion">explosion
emission">emission">emission">emission
confusion">confusion">confusion">confusion
confession">confession">confession">confession
conclusion">conclusion">conclusion">conclusion
corrosion">corrosion">corrosion">corrosion
diffusion">diffusion">diffusion">diffusion
division">division">division">division
delusion">delusion">delusion">delusion
decision">decision">decision">decision
discussion">discussion">discussion">discussion
duration">duration">duration">duration
emulsion">emulsion">emulsion">emulsion
erosion">erosion">erosion">erosion
fusion">fusion">fusion">fusion
lesion">lesion">lesion">lesion
mission">mission">mission">mission
mansion">mansion">mansion">mansion
obsession">obsession">obsession">obsession
passion">passion">passion">passion
permission">permission">permission">permission
pension">pension">pension">pension
recession">recession">recession">recession
session">session">session">session
secession">secession">secession">secession
tension">tension">tension">tension
unison">unison">unison">unison
venison">venison">venison">venison
version">version">version">version
vision">vision">vision">vision
conclusion
ANSWER
Here are some:
fashion
cushion
fashion
tension
Fusion Fission
I only know one word that starts with de- and endsin -sion is decision.
Some examples are expansion (root word: expand), persuasion (root word: persuade), and confession (root word: confess).
Expand\expandsion
I think the answer you want is "nouns" . tion and sion are suffixes that change a verb into a noun. eg. associate -> association . The trick is to know which ending to use.
A list of words that end with ES:admiresbootiesclothesduesglasseshadesseriesyes
Some nouns that end with the suffix -sion are:abrasionconclusionconfusionderissiondiffusiondivisionemissionfissionfusionlesionmansionmissionomissionpassionpermissionremissionsessionvision
Words ending with "ition":AbolitionAcquisitionAdditionAmbitionAmmunitionApparitionAuditionCoalitionCompetitionCompositionConditionContritionDefinitionDemolitionDispositionEditionExhibitionExpeditionExtraditionIgnitionImpositionInhibitionInquisitionIntuitionMalnutritionOppositionPartitionPetitionPositionPrepositionProhibitionPropositionRecognitionRenditionRepetitionRequisitionSuperstitionTraditionTransitionTuitionWords ending with "sion":AbrasionAdmissionAggressionAllusionAscensionCessionCollisionCommissionCompassionCompressionCompulsionConcessionConclusionConcussionConfessionConfusionConversionConvulsionCorrosionDecisionDiffusionDimensionDiscussionDiversionDivisionEnvisionExclusionExcursionExplosionExpressionIllusionImplosionIncisionInvasionMansionObsessionSeclusionSessionTensionVision
Roman Catholic Diocese of Sion ended in 1628.
Sion Mills railway station ended in 1965.
tension and lesion.