(bound form) groundless; unfounded; refers to rumors or gossip such as 流言蜚语 liú​yán​fēi​yǔ

(bound form) to fly; same as 飞 fēi in older literature

(bound form) used in 蜚蠊 fěi​lián (cockroach)

(literary) an oval, foul-smelling insect that eats the flowers of rice plants