Leveled Word Cards (English Language Development) (Grade 4)
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scientists
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© Pearson Education, Inc.
Grade 4, Unit 5, Week 4
scientistsscientists
168
Definition
people who study science
In Context
Scientists often travel to unknown
places to research new things.
Part of Speech
Noun
Making Word Connections
science, scientific
More Word Connections
research, laboratory, investigate,
data
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unknown
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© Pearson Education, Inc.
Grade 4, Unit 5, Week 4
unknownunknown
Definition
not discovered or explored
In Context
He explored unknown lands to see
if he could find riches there.
Part of Speech
Adjective
Synonym
unfamiliar
Antonyms
known, familiar
Making Word Connections
unknowingly
More Word Connections
people, strange, new, discovering
169
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astronaut
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© Pearson Education, Inc.
Grade 4, Unit 5, Week 5
astronautastronaut
Definition
someone who travels into space
In Context
The first astronaut to walk on the
moon was Neil Armstrong.
Part of Speech
Noun
Synonym
spaceman
Making Word Connections
astronomy
More Word Connections
moon, spacecraft, space, spacesuit
170
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challenging
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© Pearson Education, Inc.
Grade 4, Unit 5, Week 5
challengingchallenging
Definition
testing your skill or ability
171
In Context
It was a challenging task for the
astronauts to walk on the moon
without floating away.
Part of Speech
Adjective
Synonyms
difficult, demanding
Making Word Connections
challenge, challenged
More Word Connections
dangerous, exciting, interesting,
ability
Academic Vocabulary
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gravity
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© Pearson Education, Inc.
Grade 4, Unit 5, Week 5
gravitygravity
Definition
the force that makes objects fall to
the ground instead of floating up
in the air
In Context
The earth’s gravity allows us to
walk on the ground without floating
into the air.
Part of Speech
Noun
Synonyms
heaviness, weight
Antonym
weightlessness
Making Word Connections
gravitate, gravitation
More Word Connections
earth, space, force
172
Academic Vocabulary
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