As adjectives the difference between raggiest and naggiest
is that raggiest is (raggy) while naggiest is (naggy).
raggiest
English
Adjective
(head)
(raggy) raggy
English
Adjective
(er)
raglike; like a rag.
scruffy; tending to dress in rags.
Similar in style to ragtime music.
naggiest
English
Adjective
(head)
(naggy)
naggy
English
Adjective
(er)
Prone to nag, irritable