What's the adjective for smoothers? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs smooth, smoothen, smoothe and smoother which may be used as adjectives within certain contexts.
“That round, smoothish surface indicates water was there present at one time.”
“We could see from our own research that in the UK young people are listening less to radio than their parents, and it's in a kind of smoothish decline.”
“The whitish and smoothish sleepers are fairly new, while the darkish and roughish sleepers may be 10 years old. Wooden sleepers are not used where there are termites.”