Spelling Lesson 15  
 

List Words

Challenge Words  

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.

 

 

translation
laziness
population
invention
generation
examination
situation
operation
sickness
kindness
closeness
forgiveness
pollution
imagination
education
transportation
federation
subtraction
smallness
lateness

 

  21.
22.
23.
24.
25.
science-fiction
questions
air-conditioning
scientific
atmosphere