看 (Kanji for observe/guard)

Onyomi

KAN

Genghis KHAN observes you with his eyes and, if you try to escape, his hands.

看護師(かんごし)

nurse ★★★☆☆
看 (observe/guard) + 護 (defend) + 師 (master, teacher) = 看護師 (nurse)

nurse - whether male or female

看板(かんばん)

store sign ★★★☆☆
看 (observe/guard) + 板 (plank) = 看板 (store sign)

store sign, signboard, billboard

看守(かんしゅ)

prison guard ☆☆☆☆☆
看 (observe/guard) + 守 (protect) = 看守 (prison guard)

You look with your EYES on what people wear,

but you discriminate based on the CRAFT of their clothing.

You guard the prisoners with your HANDS.