glue vs casein glue

glue and casein glue both are nouns.

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

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

Other hyponyms of glue include animal glue, fish glue, marine glue.

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

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