Si vs sand

Si and sand both are nouns.

Word	Noun	Adjective	Verb	Adverb
Si	Yes	No	No	No
sand	Yes	No	Yes	No

Si (noun)	sand (noun)
a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors	fortitude and determination
	a loose material consisting of grains of rock or coral

Si (verb)	sand (verb)
	rub with sandpaper