This applies to all senses. It is impossible to describe a sensory impression without comparing it to other impressions with the same sense. Example: feel a mug. Perhaps it feels cold and hard, which are both something that can't be comprehended without the sense of touch.

This is, as I see it, one of the main philosophical problems with our senses. You can never be sure that your senses work just like everyone else's, since there is no common frame of reference.

That said, I sometimes feel that taste and smell is closely enough related that I can describe one with the other. Something can smell and taste "the same" (for example, sweet).