Problem: What are the most important words?
Someone takes the seat facing hers and slumps.
Answer: face, seat, take

Problem: What are the most important words?
a prominent group of sky blue clad walkers lead the way .
Answer: lead, walker, way

Problem: What are the most important words?
atoms each atom of a specific element has the same number of protons in its nucleus .
Answer:
atom, nucleus, number, proton