Ah, I meant it as an alias, not as an implication. The cards themselves are properly called tarots; "tarot card" is a bit redundant. You might use "tarot card" to separate the cards themselves from the general tarot "theme" (as in T5etc.'s example), but since we have no interest in doing that (especially when the separate "cards" tag is available), there's no reason to alias "tarot" to "tarot_cards". Instead, there are reasons to do the reverse.