tessera vs mosaic

tessera and mosaic both are nouns.

Word	Noun	Adjective	Verb	Adverb
tessera	Yes	No	No	No
mosaic	Yes	No	No	No

tessera (noun)	mosaic (noun)
a small square tile of stone or glass used in making mosaics	art consisting of a design made of small pieces of colored stone or glass
	arrangement of aerial photographs forming a composite picture
	transducer formed by the light-sensitive surface on a television camera tube
	a pattern resembling a mosaic
	viral disease in solanaceous plants (tomatoes, potatoes, tobacco) resulting in mottling and often shriveling of the leaves