adjectival noun:

• round; circular; spherical
• mellow (flavour, voice, etc.); mild; smooth

noun:

• smooth sailing - four character idiom

noun:

• smooth hammerhead (Sphyrna zygaena, species of hammerhead shark) ➜ スムーズハンマーヘッド

noun:

• smooth fan lobster (Ibacus novemdentatus)

noun:

• slender smooth-hound (Gollum attenuatus, species of finback catshark from the Southwest Pacific)

noun / adjectival noun:

• being smooth, free and easy; refined and unconventional - four character idiom

noun:

• smooth talker; crafty person

expression:

• smooth words make smooth ways; it's not what you say, it's how you say it - proverb

noun:

• smooth muscle ➜ 横紋筋

noun:

• smooth shading - IT term

noun:

• smooth-hound (Mustelus mustelus, houndshark found in the Eastern Atlantic and Mediterranean)

noun:

• smooth scroll - IT term

noun:

• smooth unlettered back surface of an old "zeni" coin - archaism ➜ 銭【ぜに】

noun:

• smooth dandelion (Taraxacum laevigatum)

noun:

• smooth hammerhead (Sphyrna zygaena, species of hammerhead shark)

noun:

• dusky smooth-hound (Mustelus canis, species of hound shark found in the Western Atlantic)

noun:

• smalleye smooth-hound (Mustelus higmani, species of houndshark from the western Atlantic)

adjective:

• smooth talking

adjectival noun / noun:

• smooth and refreshing (of sake); light with a clean finish

noun:

• spotless smooth-hound (Mustelus griseus, species of houndshark from the northwest Pacific)

noun:

• smooth-talking and humorous; with jocose and comical airs - four character idiom

noun:

• spotted estuary smooth-hound (Mustelus lenticulatus, species of houndshark found around southern Australia and New Zealand)

expression / ~する verb (irregular):

• to smooth; to harmonize; to facilitate; to streamline

expression / godan ~す verb:

• to smooth out; to straighten; to relax

adjectival noun / noun:

• smooth-spoken