weekend vs Sun

weekend and Sun both are nouns.

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

weekend (noun)	Sun (noun)
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	the star that is the source of light and heat for the planets in the solar system
	first day of the week; observed as a day of rest and worship by most Christians

weekend (verb)	Sun (verb)
spend the weekend