• 蚊か — mosquito
• 蚊帳かや — mosquito net
• 蚊柱かばしら — swarm of mosquitoes
• 蚊取りかとり — mosquito repellent; mosquito coil

The insect radical shows that this kanji is about a small creature, and the right side acts as the sound part, linked to the buzzing “bun-bun” noise. Together they point to the familiar flying insect that bites and whines in the summer.