lobster-backed vs red-coated

lobster-backed and red-coated both are adjectives.

Word	Noun	Adjective	Verb	Adverb
lobster-backed	No	Yes	No	No
red-coated	No	Yes	No	No

As adjectives, lobster-backed and red-coated are synonyms defined as:

lobster-backed and red-coated: used of British soldiers during the American Revolutionary War because of their red coats

lobster-backed (adjective)	red-coated (adjective)
used of British soldiers during the American Revolutionary War because of their red coats	used of British soldiers during the American Revolutionary War because of their red coats