Verbs
Nouns
Adjectives
Adverbs and Expressions
collocations
100

I will ___________ to your email as soon as possible.

respond

100

the noun from the verb prevent.

prevention 

100

consistently good in quality or performance; able to be trusted.


reliable

100

well might happen or be true; probable.

likely

100

to reduce the consumption of something

cut back on

200

protect from harm or danger.

defend

200

an idea used to explain something

theory

200

created by human beings, not by nature

artificial

200

spoken words that tell machines what to do  

natural language commands

200

coal, petroleum, and natural gas

fossil fuels

300

have or hold (someone or something) within.

contain

300

work that involves studying something
 

research

300

concerned with the actual doing or use of something rather than with theory and ideas.

practical

300

existing or happening throughout the world

worldwide

300

something that can be used instead of another thing

alternative to

400

introduce (a liquid, especially a drug or vaccine) into the body using a special tool like a syringe.

inject

400

conditions which affect what happens in a situation

circumstances

400

having the ability, fitness, or quality necessary to do or achieve a specified thing.

capable

400

body parts that people have, such as eyes, ears, and arms

human features

400

Carbon dioxide or CO2 stemming from the burning of fossil fuels and the manufacture of different products 

carbon  emission  

500

I forgot to____________ the files to my message, so I will send them separately.

attach

500

how easy something is for people to use  

accessibility

500

habitually or typically occurring or done; customary

Usual

500

 machine that can be somewhere that a person can't be  
 

 remote presence device

500

things that prevent people from using something
 

 barriers to entry