pipe / a wind instrument

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

an egg

an ovum

an egg, including fish roe / the beginning or start of something (compare the uses of English terms kernel and seed) / a beginner or rookie at something

tube; pipe; duct; tract

a pipe or tube, such as that made of bamboo, wood, metal, or rubber / a shuttle for weaving with a loom (from the way the earliest shuttles were made from bamboo tubes)

to say goodbye

(literary) they (about women or girls)

quack doctor