I think the problem is that the word pleasure is like "true* and can be used in multiple ways, but I would say one of the ways is that pleasure is a feeling and operates automatically and irrationally just like sugar is sweet.
Yes you can look at those words and say that sugar and sweet are concepts, but in these cases the meaning is obvious and nothing is needed beyond "pointing to them."
Pleasure can also be viewed as a concept on the same level as "virtue" and "piety"
The trick is being clear in how we use them.
Happy is also fairly clear in meaning, but "happiness" would be almost like "pleasure ness" - a term we do not use. If we did use that term we would evoke similar problems and ambiguities as we do when we refer to "happiness"
This is a VERY productive conversation because I think its resolution will clear up a lot of problems.