decubitus ulcer vs bedsore

decubitus ulcer and bedsore both are nouns.

Word	Noun	Adjective	Verb	Adverb
decubitus ulcer	Yes	No	No	No
bedsore	Yes	No	No	No

As nouns, decubitus ulcer and bedsore are synonyms defined as:

decubitus ulcer and bedsore: a chronic ulcer of the skin caused by prolonged pressure on it (as in bedridden patients)

Other synonyms of decubitus ulcer include pressure sore.

decubitus ulcer (noun)	bedsore (noun)
a chronic ulcer of the skin caused by prolonged pressure on it (as in bedridden patients)	a chronic ulcer of the skin caused by prolonged pressure on it (as in bedridden patients)