How are xerophytes and phreatophytes equally synonymous

To the Dry plants or Xerophytes (Greek xeros = dry; phytos = plant) belong to those types of plants that are adapted to extremely arid locations. These can be both hot (deserts, steppes) and cold (tundra) ecosystems. Succulents (including agaves, aloes or cacti) and conifers (e.g. pine, spruce or fir) are among the best-known xerophyte plants.
Xerophytes are specially adapted to their habitat:

root: have a very deep and widely branched root system. In this way, on the one hand, access to deeper water supplies can be secured and, on the other hand, a maximum of water can be absorbed during short-term rain showers.

Stem axis: is usually an important isolate from the environment. In addition, the succulents of the cacti are able to store large amounts of water and also take over photosynthesis.

leaves: As the number of leaves increases, so does the evaporation surface, which is why most desert plants develop only a few or no leaves. If they do have leaves, they are only very small, with a few stomata and a thick epidermis. Some desert plants even only develop thorns instead of leaves.
In the case of conifers, the shape of the needles itself reduces transpiration. Furthermore, a waxy layer, sunken stomata and a thick cuticle ensure the smallest possible evaporation.