<div class="items">
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
</div>

<div id="result">
  <div class="nl"></div>
  <div class="col"></div>
</div>

let nodelist = document.querySelectorAll(".items .item").constructor.name;
let collection = document.getElementsByClassName(".items .item").constructor.name;

document.querySelector(".nl").innerHTML = nodelist;
document.querySelector(".col").innerHTML = collection;