gyrostabiliser vs gyrostabilizer

gyrostabiliser and gyrostabilizer both are nouns.

Word	Noun	Adjective	Verb	Adverb
gyrostabiliser	Yes	No	No	No
gyrostabilizer	Yes	No	No	No

As nouns, gyrostabiliser and gyrostabilizer are synonyms defined as:

gyrostabiliser and gyrostabilizer: a stabilizer consisting of a heavy gyroscope that spins on a vertical axis; reduces side-to-side rolling of a ship or plane

gyrostabiliser (noun)	gyrostabilizer (noun)
a stabilizer consisting of a heavy gyroscope that spins on a vertical axis; reduces side-to-side rolling of a ship or plane	a stabilizer consisting of a heavy gyroscope that spins on a vertical axis; reduces side-to-side rolling of a ship or plane