Unit 4, Lesson 1
analogy
catalog
centimeter
cyclops
diameter
encyclopedia
epilogue
geocentric
geode
geography
geologist
geometry
logical
logo
millimeter
motorcycle
perimeter
speedometer
tricycle
unicycle
Challenge Words
apogee
barometer
cyclical
Unit 4, Lesson 2
activist
carnivorous
cartoonist
cautious
chemist
colonist
cyclist
ferocious
florist
furious
gracious
guitarist
journalist
marvelous
mysterious
numerous
optimist
ridiculous
venomous
zoologist
Challenge Words
anonymous
courageous
psychologist
Unit 4, Lesson 3
coauthor
coeducation
coexist
cooperate
coordinate
coproduce
forecast
forego
forerunner
foresee
foresight
forewarn
foreword
misbehave
misfortune
mishap
misinform
misrepresent
misunderstand
misuse
Challenge Words
coincidence
foreboding
misconduct
Unit 4, Lesson 4
deactivate
deconstruct
deflate
dehydrate
derail
illegal
illegible
illiterate
illogical
imbalance
immature
immovable
impractical
improper
inaccurate
inappropriate
inefficient
infinite
infrequent
injustice
Challenge Words
decontaminate
impartial
incompetent
Unit 4, Lesson 5
antibiotic
audible
audience
audio
audiobook
audiology
audiotape
audiovisual
auditorium
auditory
biodegradable
biodiversity
biographer
biography
biologist
biology
biomes
biopsy
biosphere
inaudible
Challenge Words
microbiologist
audiologist
symbiotic
analogy
catalog
centimeter
cyclops
diameter
encyclopedia
epilogue
geocentric
geode
geography
geologist
geometry
logical
logo
millimeter
motorcycle
perimeter
speedometer
tricycle
unicycle
Challenge Words
apogee
barometer
cyclical
Unit 4, Lesson 2
activist
carnivorous
cartoonist
cautious
chemist
colonist
cyclist
ferocious
florist
furious
gracious
guitarist
journalist
marvelous
mysterious
numerous
optimist
ridiculous
venomous
zoologist
Challenge Words
anonymous
courageous
psychologist
Unit 4, Lesson 3
coauthor
coeducation
coexist
cooperate
coordinate
coproduce
forecast
forego
forerunner
foresee
foresight
forewarn
foreword
misbehave
misfortune
mishap
misinform
misrepresent
misunderstand
misuse
Challenge Words
coincidence
foreboding
misconduct
Unit 4, Lesson 4
deactivate
deconstruct
deflate
dehydrate
derail
illegal
illegible
illiterate
illogical
imbalance
immature
immovable
impractical
improper
inaccurate
inappropriate
inefficient
infinite
infrequent
injustice
Challenge Words
decontaminate
impartial
incompetent
Unit 4, Lesson 5
antibiotic
audible
audience
audio
audiobook
audiology
audiotape
audiovisual
auditorium
auditory
biodegradable
biodiversity
biographer
biography
biologist
biology
biomes
biopsy
biosphere
inaudible
Challenge Words
microbiologist
audiologist
symbiotic