Problem: What are the most important words?
cupid lying on cloud shaped like heart .
Answer: cloud, cupid, heart, shape

Problem: What are the most important words?
astronaut became country to egress his spacecraft while in orbit on the mission
Answer: astronaut, orbit, spacecraft

Problem: What are the most important words?
species the narrowest group an organism can be classified into is a species .
Answer:
organism, specie, species