postilion vs postillion

postilion and postillion both are nouns.

Word	Noun	Adjective	Verb	Adverb
postilion	Yes	No	No	No
postillion	Yes	No	No	No

As nouns, postilion and postillion are synonyms defined as:

postilion and postillion: someone who rides the near horse of a pair in order to guide the horses pulling a carriage (especially a carriage without a coachman)

postilion (noun)	postillion (noun)
someone who rides the near horse of a pair in order to guide the horses pulling a carriage (especially a carriage without a coachman)	someone who rides the near horse of a pair in order to guide the horses pulling a carriage (especially a carriage without a coachman)