mucilage vs fish glue

mucilage and fish glue both are nouns.

Word	Noun	Adjective	Verb	Adverb
mucilage	Yes	No	No	No
fish glue	Yes	No	No	No

As nouns, fish glue is a hyponym of mucilage; that is, fish glue is a word with a more specific, narrower meaning than mucilage:

mucilage: cement consisting of a sticky substance that is used as an adhesive
fish glue: gelatinous substance obtained by boiling skins fins and bones of fish

Other hyponyms of mucilage include animal glue, casein glue, marine glue.

mucilage (noun)	fish glue (noun)
a gelatinous substance secreted by plants	gelatinous substance obtained by boiling skins fins and bones of fish
cement consisting of a sticky substance that is used as an adhesive