蚤

Its parts

• 叉 chā fork = 又 + 丶 sound
• 虫 chóng lower form of animal life, including… meaning

Other characters with 叉 as their sound:

杈 chā汊 chà钗 chāi衩 chǎ扠 chā

Dictionaries file it under 虫.

In other characters

Gives the sound in

搔 sāo骚 sāo瘙 sào慅 sāo糔 xiǔ

Also in

𩙫 sāo