A phenotype is a trait we can observe. Genes carry instructions, and the result of our body following those instructions (for example, making a pigment in our eyes), is a phenotypic trait, like eye color.
The medical term for expanding or opening wider is. apnea. the medical term for lack of or absence of breathing is. tissue. the medical term for groups of cells with the same function is. cell. the medical term for the basic unit of body structure is. menarche.
I don't think you can say they're the same thing. Dyspnea is difficulty breathing, or labored breathing. Shortness of breath is... just feeling of short of breath, like when you just did a two-mile run. You can feel short of breath but not necessarily have difficulty breathing.