create alias pdw -> submachine_gun
Technically PDWs and SMGs aren't the same thing, but given that the P90 is usually tagged with submachine_gun I think we can safely say that most users of this site either don't know the difference or don't care enough to make the distinction.
EDIT: This tag alias has been rejected because it was not approved within 60 days.
EDIT: The tag alias pdw -> submachine_gun has been rejected by @DanbooruBot.
Updated by DanbooruBot