glia vs astroglia

glia and astroglia both are nouns.

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

As nouns, astroglia is a hyponym of glia; that is, astroglia 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
astroglia: tissue consisting of large stellate neuroglial cells

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

glia (noun)	astroglia (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	tissue consisting of large stellate neuroglial cells