Question

sort words according to the meanings of their suffixes. fiercest darkest provider explorer dimmest loser suffix means one who does an action suffix means most

Explanation:

The suffix "-er" means one who does an action, so "provider", "explorer", "loser" fit this category. The suffix "-est" means most, so "fiercest", "darkest", "dimmest" belong here.

Answer:

suffix means one who does an action: provider, explorer, loser
suffix means most: fiercest, darkest, dimmest