pure vs virgin

pure is not a noun while virgin is a noun.

Word	Noun	Adjective	Verb	Adverb
pure	No	Yes	No	No
virgin	Yes	Yes	No	No

As adjectives, pure and virgin are synonyms defined as:

Other synonyms of pure include vestal, virginal, virtuous.

pure (noun)	virgin (noun)
	a person who has never had sex

pure (adjective)	virgin (adjective)
(used of persons or behaviors) having no faults; sinless	in a state of sexual virginity
free of extraneous elements of any kind	being used or worked for the first time
(of color) being chromatically pure; not diluted with white or grey or black
in a state of sexual virginity
free from discordant qualities
concerned with theory and data rather than practice; opposed to applied
without qualification; used informally as (often pejorative) intensifiers