Is it though? I though akarui and karui were quite distinct, but I guess they kinda sound similar?
https://jisho.org/word/%E6%98%8E%E3%82%8B%E3%81%84 / https://jisho.org/word/%E6%98%8E%E3%81%8B%E3%82%8A (adjective vs noun but clearly just the same word in different form)
vs
https://jisho.org/word/%E8%BB%BD%E3%81%84 (light weight)