glia vs microglia

glia and microglia both are nouns.

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

As nouns, microglia is a hyponym of glia; that is, microglia is a word with a more specific, narrower meaning than glia:

glia: 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
microglia: neuroglial tissue of mesodermal origin that can become phagocytic

Other hyponyms of glia include astroglia, macroglia, oligodendria, oligodendroglia.

glia (noun)	microglia (noun)
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	neuroglial tissue of mesodermal origin that can become phagocytic