pressure sore vs decubitus ulcer

pressure sore and decubitus ulcer both are nouns.

Word	Noun	Adjective	Verb	Adverb
pressure sore	Yes	No	No	No
decubitus ulcer	Yes	No	No	No

As nouns, pressure sore and decubitus ulcer are synonyms defined as:

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

Other synonyms of pressure sore include bedsore.

pressure sore (noun)	decubitus ulcer (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)