microglia vs neuroglia

microglia and neuroglia both are nouns.

Word	Noun	Adjective	Verb	Adverb
microglia	Yes	No	No	No
neuroglia	Yes	No	No	No

As nouns, neuroglia is a hypernym of microglia; that is, neuroglia is a word with a broader meaning than microglia:

microglia: neuroglial tissue of mesodermal origin that can become phagocytic
neuroglia: sustentacular tissue that surrounds and supports neurons in the central nervous system; glial and neural cells together compose the tissue of the central nervous system

Other hypernyms of microglia include glia.

microglia (noun)	neuroglia (noun)
neuroglial tissue of mesodermal origin that can become phagocytic	sustentacular tissue that surrounds and supports neurons in the central nervous system; glial and neural cells together compose the tissue of the central nervous system