All these words are homophones of fei.
吠 barking dog fei4
肺 lung fei4
非 don’t no negation fei1
飞 fly fei1
肥 fat fei2
费 fee fei4 a cognate! hug it. it is VERY lonely!
菲 ancient radish fei3 now used as a metaphor for poor and not used literally anymore
废 aboilition fei4 kinda like a certain Bill which shalt remain nameless
匪 fucking bandit fei3
翡 kingfisher fei3
霏 falling snow fei1