覚醒剤 （カクセイザイ） stimulant (e.g. psychoactive drugs like methamphetamine, ritalin, etc.)

覚悟 （カクゴ） readiness, (mental) preparedness, resolution, determination, resignation (to one's fate)

視聴覚 （シチョウカク） senses of seeing and hearing, audiovisual

才覚 （サイカク） ready wit, quick wits, resourcefulness, talent, acumen, powers, knack, raising (money)

覚える （おぼえる） to memorize, to memorise, to commit to memory, to learn by heart, to bear in mind, to remember, to learn, to pick up, to acquire, to feel, to think, to regard

覚ます （さます） to awaken, to arouse from sleep, to bring to one's senses, to disabuse (someone of), to sober up, to dampen, to throw a damper on, to spoil

覚める （さめる） to wake, to wake up, to become sober, to sober up, to regain consciousness (e.g. after anaesthesia), to come to one's senses, to be disillusioned

悟る （さとる） to perceive, to sense, to become aware, to notice, to detect, to discern, to understand, to comprehend, to realize, to attain enlightenment