table napkin vs bib

table napkin and bib both are nouns.

Word	Noun	Adjective	Verb	Adverb
table napkin	Yes	No	No	No
bib	Yes	No	Yes	No

As nouns, bib is a hyponym of table napkin; that is, bib is a word with a more specific, narrower meaning than table napkin:

table napkin: a small piece of table linen that is used to wipe the mouth and to cover the lap in order to protect clothing
bib: a napkin tied under the chin of a child while eating

Other hyponyms of table napkin include dinner napkin, tea napkin.

table napkin (noun)	bib (noun)
a small piece of table linen that is used to wipe the mouth and to cover the lap in order to protect clothing	a napkin tied under the chin of a child while eating
	top part of an apron; covering the chest

table napkin (verb)	bib (verb)
	drink moderately but regularly