virgin vs pure

virgin is a noun but pure is not a noun.

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

As adjectives, virgin and pure are synonyms defined as:

Other synonyms of virgin include vestal, virginal, virtuous.

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

virgin (adjective)	pure (adjective)
in a state of sexual virginity	(used of persons or behaviors) having no faults; sinless
being used or worked for the first time	free of extraneous elements of any kind
	(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