histiocyte vs macrophage

histiocyte and macrophage both are nouns.

Word	Noun	Adjective	Verb	Adverb
histiocyte	Yes	No	No	No
macrophage	Yes	No	No	No

As nouns, macrophage is a hypernym of histiocyte; that is, macrophage is a word with a broader meaning than histiocyte:

histiocyte: a macrophage that is found in connective tissue
macrophage: a large phagocyte; some are fixed and other circulate in the blood stream

histiocyte (noun)	macrophage (noun)
a macrophage that is found in connective tissue	a large phagocyte; some are fixed and other circulate in the blood stream