Neither are scientific terms, which makes things especially tricky. Both tend to imply that offspring will look like the parents. Phase tends to imply line-bred or locality specific visual appearance, though (particularly with geckos) "morph" is used in the same way on occasion.
Sometimes "phase" can be used to describe a subset of individuals of a particular "morph" that have a distinct look, such as with "white phase albino reticulated pythons". In that instance, the morph is "albino", but it has a wide range of how it may look, typically purple, lavender, or white.
Confused yet?
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