Yes, purer is a Scrabble word!

Adjective

1. Free of extraneous elements of any kind

2. Without qualification; used informally as (often pejorative) intensifiers

3. (of color) being chromatically pure; not diluted with white or grey or black

4. Free from discordant qualities

5. Concerned with theory and data rather than practice; opposed to applied

6. (used of persons or behaviors) having no faults; sinless

7. In a state of sexual virginity