As adverbs the difference between exclusively and principally
is that exclusively is to the exclusion of anything or anyone else; solely or entirely while principally is in a primary manner; pertaining to the principal of a matter.
exclusively
English
Adverb
(
en adverb)
(focus) to the exclusion of anything or anyone else; solely or entirely
principally
English
Adverb
(-)
In a primary manner; pertaining to the principal of a matter.