息 (Kanji for son / breath)

JERK. - it has 3 different meanings, AND the most commonly used meaning has a fucked-up unorthodox pronunciation (sigh)!!

Onyomi

SOKU	I bought my son SOCKS for his birthday. I am a lame dad!

My own son is as dear to me as my own heart!

いき	breath ★★★★☆

息子(むすこ)

son ★★★★★ FP
息 (son / breath) + 子 (child) = 息子 (son)

利息(りそく)

interest ★☆☆☆☆
利 (handy) + 息 (son / breath) = 利息 (interest)

interest on a loan, bank account, CD or a bond.(BOOBOO: but not a stock! Stocks pay dividends, or 配当金 (はいとうきん))