red bone marrow vs red marrow

red bone marrow and red marrow both are nouns.

Word	Noun	Adjective	Verb	Adverb
red bone marrow	Yes	No	No	No
red marrow	Yes	No	No	No

As nouns, red bone marrow and red marrow are synonyms defined as:

red bone marrow and red marrow: bone marrow of children and some adult bones that is required for the formation of red blood cells

red bone marrow (noun)	red marrow (noun)
bone marrow of children and some adult bones that is required for the formation of red blood cells	bone marrow of children and some adult bones that is required for the formation of red blood cells