When we use the phrase "is in need of", we are indicating that someone or something requires something that they currently lack. Alternatively, there are many synonyms that can be used in place of this phrase to convey similar meaning like "requires," "needs," "must have," "craves," "yearns for," "longs for," "necessitates," "calls for," "demands," "entails," and "mandates." Each of these words can be used in various contexts where the sense of lack or deprivation is present. The usage of these synonyms can add variety and richness to language while expressing the same idea.