補強
ほきょう · hokyou · JLPT N1 · noun
support
🧱 補 = supplement + 強 = strong: adding support to make something stronger
The 強 (きょう, kyou) part means strong and shares its sound with the reading. 補 (ほ, ho) means to supplement or patch, as in filling a gap to make a structure sturdier.