casein glue vs glue

casein glue and glue both are nouns.

Word	Noun	Adjective	Verb	Adverb
casein glue	Yes	No	No	No
glue	Yes	No	Yes	No

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

Other hypernyms of casein glue include gum, mucilage.

casein glue (noun)	glue (noun)
made from casein; used for e.g. plywood and cabinetwork	cement consisting of a sticky substance that is used as an adhesive

casein glue (verb)	glue (verb)
	be fixed as if by glue
	join or attach with or as if with glue