Sun vs weekend

Sun and weekend both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sun	Yes	No	No	No
weekend	Yes	No	Yes	No

Sun (noun)	weekend (noun)
the star that is the source of light and heat for the planets in the solar system	a time period usually extending from Friday night through Sunday; more loosely defined as any period of successive days including one and only one Sunday
first day of the week; observed as a day of rest and worship by most Christians

Sun (verb)	weekend (verb)
	spend the weekend