redcoat vs lobsterback

redcoat and lobsterback both are nouns.

Word	Noun	Adjective	Verb	Adverb
redcoat	Yes	No	No	No
lobsterback	Yes	No	No	No

As nouns, redcoat and lobsterback are synonyms defined as:

redcoat and lobsterback: British soldier; so-called because of his red coat (especially during the American Revolution)

redcoat (noun)	lobsterback (noun)
British soldier; so-called because of his red coat (especially during the American Revolution)	British soldier; so-called because of his red coat (especially during the American Revolution)