As nouns the difference between prillion and pillion
is that prillion is tin extracted from the slag while pillion is a pad behind the saddle of a horse for a second rider.
As an adverb pillion is
riding behind the driving rider, as when positioned on the rump of a mount.
pillion
English
Noun
(
en noun)
A pad behind the saddle of a horse for a second rider.
*
A similar second saddle on a motorcycle for a passenger.
The person riding in the pillion.
Adverb
(
en adverb)
Riding behind the driving rider, as when positioned on the rump of a mount.