library paste vs wafer

library paste and wafer both are nouns.

Word	Noun	Adjective	Verb	Adverb
library paste	Yes	No	No	No
wafer	Yes	No	No	No

As nouns, wafer is a hyponym of library paste; that is, wafer is a word with a more specific, narrower meaning than library paste:

library paste: an adhesive made from water and flour or starch; used on paper and paperboard
wafer: a small adhesive disk of paste; used to seal letters

library paste (noun)	wafer (noun)
an adhesive made from water and flour or starch; used on paper and paperboard	a small thin crisp cake or cookie
	thin disk of unleavened bread used in a religious service (especially in the celebration of the Eucharist)
	a small adhesive disk of paste; used to seal letters