壺 （コ） hu (ancient Chinese vessel shaped like a vase, usually used to store alcohol)

壺中 （コチュウ） inside a jar, coward, timid person

投壺 （トウコ） pitch-pot (stick-throwing game)

唾壷 （ダコ） spittoon

壺 （つぼ） pot, jar, vase, dice cup, depression, basin (e.g. of a waterfall), aim, what one wants, the mark, key point (of a conversation, etc.), essence, acupuncture point, moxibustion point, pressure point, position on the fingerboard (of a shamisen, koto, etc.), target (when aiming an arrow)

壷洗い （つぼあらい） individually "washing" a partner's fingers or toes in one's vagina (esp. as a service at a soapland)

前つぼ （まえつぼ） frontal sandal strap (between the toes)

酒壺 （さかつぼ） sake jar, jar containing alcohol