postillion vs postilion

postillion and postilion both are nouns.

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

As nouns, postillion and postilion are synonyms defined as:

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

postillion (noun)	postilion (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)