• 臭におう — to smell; to give off an odor
• 臭くさい — smelly; stinky
• 悪臭あくしゅう — foul smell; stench
• 体臭たいしゅう — body odor
• 無臭むしゅう — odorless; no smell
• 芳臭ほうしゅう — fragrant smell
• 臭気しゅうき — odor; smell in the air

The older form showed a nose and a dog, symbolizing an animal sniffing out a scent. From that image, the meaning became smell, odor, or stench.