Words ending
in -sion.

collide → collision

A crash between two moving things.

“No one was hurt in the collision.”

comprehend → comprehension

Understanding.

“The test checks reading comprehension.”

conclude → conclusion

The end, or a judgement you reach.

“Read the conclusion of the story aloud.”

confuse → confusion

Not understanding what is happening.

“There was confusion about the time.”

convert → conversion

Changing from one form to another.

“We did a conversion from metres to centimetres.”

decide → decision

A choice you make after thinking.

“It was a hard decision to leave.”

No common root word

A measurement such as length, width or height.

“A cube has three dimensions.”

divert → diversion

A different route, or something fun.

“A diversion sent the traffic down a side road.”

divide → division

Splitting something into parts or groups.

“We practised division with sweets.”

erode → erosion

Slow wearing away by wind or water.

“Erosion shaped the cliffs over time.”

exclude → exclusion

Being left out.

“The rules ban the exclusion of new players.”

No common root word

A short trip, often for a group.

“The class went on an excursion to the museum.”

expand → expansion

Growing larger.

“The expansion of the library added a reading room.”

explode → explosion

A sudden loud burst.

“The explosion of the firework lit the sky.”

extend → extension

A part added to make something longer.

“The class got an extension on the project.”

fuse → fusion

Joining things together into one.

“The song is a fusion of jazz and pop.”

No common root word

Something that tricks your eyes or mind.

“The lines look curved, but it is an illusion.”

include → inclusion

Being part of a group.

“The club welcomes the inclusion of everyone.”

intrude → intrusion

Coming in where you are not wanted.

“Sorry for the intrusion during your lesson.”

invade → invasion

Entering a place by force.

“The castle was built to stop an invasion.”

No common root word

A very large house.

“The mansion had forty rooms.”

No common root word

A special event or a particular time.

“A birthday is a happy occasion.”

persuade → persuasion

Making someone believe or do something.

“It took some persuasion to try the soup.”

provide → provision

Something supplied, often for later.

“They packed provisions for the trip.”

revise → revision

Changes made to improve something.

“Her second draft needed little revision.”

suspend → suspension

Stopping something for a time.

“Heavy snow led to the suspension of buses.”

televise → television

A device for watching programmes.

“We watched the match on television.”

tense → tension

A feeling of worry, or tightness.

“You could feel the tension before the result.”

No common root word

One form of something.

“This is the shorter version of the story.”

No common root word

The ability to see, or a picture in your mind.

“Glasses can help your vision.”