backed vs straight-backed

backed and straight-backed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
backed	No	Yes	No	No
straight-backed	No	Yes	No	Yes

backed (adjective)	straight-backed (adjective)
having a back or backing, usually of a specified type	having a straight back
used of film that is coated on the side opposite the emulsion with a substance to absorb light

backed (adverb)	straight-backed (adverb)
	in a straight-backed manner