fish glue vs mucilage

fish glue and mucilage both are nouns.

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

As nouns, mucilage is a hypernym of fish glue; that is, mucilage is a word with a broader meaning than fish glue:

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

Other hypernyms of fish glue include animal product, glue, gum.

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