Which word in the passage expresses eagerness? melodist songs still panting

   The word that better express eagerness is panting.

Explanation:

  Even though I answered "panting" in this question and despite the question give me only one answer (Which word), I think that "Still" can be expresses like eagerness and I am going to explain it here. Whether you are in "panting" for something, maybe you are waiting for a specifically situation or thing is going to happen. You are anxious about, for example, to get some money, to get a job, to pass in an exam etc. These happening can be understanding like "EAGERNESS".

    Now I am going to talk about the word "Still". Before I start, I need to put here an example about that: I am still waiting your payment about my work. In this example, you are anxious for waiting the payment about a work you did and it refers to "eagerness". In other hand, this word can be used without this meaning, as the follwoing example: I'm still here. I won't help you, though. In this example is not like an eagerness. You are just telling you are not help the other person.

     In spite of answering only "Eagerness", I explained about other word that can be express like "eagerness".

what is the question.. you are more likely giving us something to read with no question

- "the basic difference between keywords and subjects is that subjects (or "subject headings") have been predetermined, while keywords have not. a keyword is an easy place to start because you can use any word that seems to fit your search; this is called "natural language" searching."