red marrow vs red bone marrow

red marrow and red bone marrow both are nouns.

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

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

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

red marrow (noun)	red bone 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