system of macrophages vs MPS

system of macrophages and MPS both are nouns.

Word	Noun	Adjective	Verb	Adverb
system of macrophages	Yes	No	No	No
MPS	Yes	No	No	No

As nouns, system of macrophages and MPS are synonyms defined as:

system of macrophages and MPS: a widely distributed system of free and fixed macrophages derived from bone marrow

Other synonyms of system of macrophages include mononuclear phagocyte system.

system of macrophages (noun)	MPS (noun)
a widely distributed system of free and fixed macrophages derived from bone marrow	a widely distributed system of free and fixed macrophages derived from bone marrow