Problem: What are the most important words?
politician greets a small crowd of invited guests upon his arrival
Answer: arrival, crowd, greet, guest, politician

Problem: What are the most important words?
biological species reaching out its tongue whilst having a bath in water
Answer: bath, specie, water

Problem: What are the most important words?
tropical floral seamless pattern with hibiscus flowers in violet and green colors .
Answer:
color, pattern, violet