different kanji with the same Japanese reading
Linguistic term for words that share a kun'yomi reading but are written with different kanji, often with related meanings. Common examples include 暑い (hot weather) and 熱い (hot to the touch), or 油 (oil) and 脂 (fat/grease).
"暑い" and "熱い" are typical examples of different kanji with the same Japanese reading.
Distinguishing between different kanji with the same reading is difficult for Japanese learners.