a fifty-year-old

Short for 五十蔵 (Gojūzō):

rubber (pliable material derived from the sap of the rubber tree) / short for 消しゴム (keshi-gomu, “rubber (eraser)”) / short for ヘアゴム (hea-gomu, “hair tie, scrunchie”) / (slang) condom

Qom (a city in Iran)

(music) perfect fifth (interval between the first and second overtones or of seven semitones)

the sound of singing; singing voice

an agglutinative language

to pass (a test)

(linguistics) neologism, new word, word of recent origin

eternity; eon