PWA is an acronym, a single unit, so in order to make that unit plural, add -s, ...
Ah~~Ok, now I got it. :D
How about "valentine" with "v" in low case?
I guess it refers to St. Valentine's Day only when it's with a capital "V".
Then what does this "valentine" mean as in:
The color red was chosen for its "connection to blood and the idea of of passion -- not only anger, but love, like a valentine," as stated by Frank Moore of Visual AIDS. ...(talking about the red ribbon)
Valentine can be the card, as has already be mentioned, or the person who agrees to be with you on Valentine's Day (he or she is called your valentine).