滑

カツ、コツ

すべ.る、なめ.らか

滑, 氵, 骨, 月

水

slippery, slide, slip, flunk

円滑(えんかつ): smooth; undisturbed; uninterrupted; harmonious
滑らか(なめらか): (1) smooth (e.g. skin or ground); glassy; velvety (2) fluent; smooth (speaking); without a hitch
滑る(すべる): (1) to glide; to slide (e.g. on skis); to slip (2) to fail (an examination); to bomb (when telling a joke) (3) to drop; to go down; to come down; to fall (e.g. in status)
滑稽(こっけい): funny; humorous; humourous; comical; laughable; ridiculous; joking
滑らす(ずらす): (1) to shift; to slide (e.g. something away from something else); to move (e.g. something out of the way) (2) to put off; to delay; to postpone; to stagger (e.g. working hours)