CodePen Embed - rNOvoVe

<div class="tile">
    <span>жуткодлинноеслово</span>
</div>
<div class="tile">
    <span>дом</span>
</div>
<div class="tile">
    <span>река</span>
</div>

[...document.querySelectorAll('.tile span')]
  .filter(el => el.innerText.length > 6)
  .forEach(el => { el.style.fontSize = '0.6rem' })

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