kernel
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C1 noun /ˈkɜːrnəl/

kernel

Meaning
the central, most important part of something; the edible part of a nut or seed
Example
The kernel of the argument was about fairness.
C1 noun /ˈkɪləˌwɒt/

kilowatt

Meaning
a unit of power equal to 1,000 watts
Example
The generator produces ten kilowatts of electricity.
C1 noun /kəˈlaɪdəˌskoʊp/

kaleidoscope

Meaning
A toy or instrument with mirrors and colored pieces that create changing patterns when rotated; also used metaphorically for a constantly changing sequence of patterns or elements.
Example
The city lights turned into a kaleidoscope of colors as the festival began.
C1 noun /ˈkuːdɒs/

kudos

Meaning
Praise and honor received for an achievement.
Example
She received kudos for her excellent performance.
C1 adverb /ˈnoʊɪŋli/

knowingly

Meaning
in a way that shows you are aware of something; intentionally
Example
She knowingly kept the secret from her friends.
C1 verb /ˈkɪndəl/

kindle

Meaning
to light a fire; to arouse or inspire
Example
She kindled the campfire with dry wood.
C1 noun

Kin

C1 noun /ˈnaɪt.hʊd/

knighthood

Meaning
The rank or dignity of a knight, or the ceremony of conferring knighthood.
Example
He was honored with knighthood for his contributions to science.
C1 noun /ˈkærət/

karat

Meaning
A unit for measuring the purity of gold, with 24 karats being pure gold.
Example
The ring was made of 18-karat gold.
C1 noun /kɪˈməʊnoʊ/

kimono

Meaning
a traditional Japanese robe with wide sleeves, tied with a sash
Example
She wore a beautiful silk kimono at the ceremony.
C1 adjective /kɪˈnɛtɪk/

kinetic

Meaning
Relating to or resulting from motion.
Example
Kinetic energy increases as the object moves faster.
C1 noun /næk/

knack

Meaning
a natural skill or ability; a special talent for doing something easily
Example
She has a knack for making people feel comfortable.
C1 noun /ˈkiːpˌseɪk/

keepsake

Meaning
An object kept as a reminder of a person, place, or event.
Example
She gave me a small locket as a keepsake of our friendship.
C1 noun ˈkiː.stəʊn ˈspiː.ʃiːz

keystone species

Meaning
A species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically.
Example
Wolves are a keystone species that regulate prey populations.
C1 noun /ˈkɪŋ.fɪʃ.ər/

King-Fisher

Meaning
a small bird with bright blue and orange feathers that catches fish by diving into water
Example
The colorful kingfisher dove into the pond to catch a fish.
C1 noun /ˈken.əl/

Kennel

Meaning
a small shelter for a dog; an establishment for the breeding or boarding of dogs
Example
The dog slept comfortably in his wooden kennel in the backyard.
C1 noun /nɒb/

Knob

Meaning
a rounded handle on a door or drawer; a small rounded switch on a machine
Example
He turned the brass knob to open the old wooden door.
C1 noun, adjective /ˈkɪndrəd/

kindred

Meaning
A person's relatives or family; similar in nature or character.
Example
They discovered kindred spirits in each other.
C1 verb /niːd/

knead

Meaning
to work dough or clay into a uniform mixture by pressing, folding, and stretching
Example
She kneads the dough until it becomes smooth.
C1 adjective /ˈnæk.ərd/

Knackered

Meaning
extremely tired; exhausted
Example
I'm absolutely knackered after working all day.