Problem: What are the most important words?
A fridge with a bunch of papers hanging on it.
Answer: fridge, hang, paper

Problem: What are the most important words?
species a group of organisms that can interbreed in nature and produce fertile offspring
Answer: interbreed, nature, offspring, organism, produce

Problem: What are the most important words?
converting a whole number to a fraction is easy with or without a calculator
Answer:
convert, fraction, number