To me, interference is the superposition of waves. To someone else it might be one radio station butting in on another's channel. I view neither of these as interactions.

To me, some interactions can be seen as the mutual influence of two wavicles (Feynman's word) on each other. The presence of the field from one wavicle will modify the probability distribution of finding another wavicle in any given place and any given time.

Clearly -some- interactions can be viewed as an interference of sorts.

Are you thinking of general relativity? There are waves there too, but not the sort spoken of in interaction theory... those are wiggles and splashes in space-time itself. The interaction occurs independently of those waves.

Thoughts?