horizontal stabilizer vs tailplane

horizontal stabilizer and tailplane both are nouns.

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

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

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

Other synonyms of horizontal stabilizer include horizontal stabiliser.

horizontal stabilizer (noun)	tailplane (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