tailplane vs horizontal stabiliser

tailplane and horizontal stabiliser both are nouns.

Word	Noun	Adjective	Verb	Adverb
tailplane	Yes	No	No	No
horizontal stabiliser	Yes	No	No	No

As nouns, tailplane and horizontal stabiliser are synonyms defined as:

tailplane and horizontal stabiliser: the horizontal airfoil of an aircraft's tail assembly that is fixed and to which the elevator is hinged

Other synonyms of tailplane include horizontal stabilizer.

tailplane (noun)	horizontal stabiliser (noun)
the horizontal airfoil of an aircraft's tail assembly that is fixed and to which the elevator is hinged	the horizontal airfoil of an aircraft's tail assembly that is fixed and to which the elevator is hinged