The answer to this question might be helpful here, too:

It's worth noting that canon doesn't represent the entirety of the language. Presumably what we see in-game is only a small slice of the linguistic pie. Dragons very well could have words for the things you're looking for, it's just that ancient Nords writing heroic epitaphs never got around to describing dragon bathing habits.

The dragon cult certainly had places of worship, they unfortunately just aren't mentioned in the small amount of language presented in the game. You could say something like hofkahsezein "house of worship" to mean "temple", after the fashion of hofkahsejun.