drainage / displacement (water displaced by an object in water) / Alternative spelling of 廃水. wastewater.

drain

mouth

gutter, drainage ditch, culvert

drainpipe

(Buddhism) the mouth / (Buddhism) (by extension) one's speech, one's words / the mouthpiece of a flute

used to count people / used to count per-person portions / used to count open-mouthed containers / used to count bladed weapons or tools

mouth / opening / taste (in food), preference

used to count people / used to count bladed weapons or tools

mouth