wafer vs library paste

wafer and library paste both are nouns.

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

As nouns, library paste is a hypernym of wafer; that is, library paste is a word with a broader meaning than wafer:

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

Other hypernyms of wafer include paste.

wafer (noun)	library paste (noun)
a small thin crisp cake or cookie	an adhesive made from water and flour or starch; used on paper and paperboard
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