The word "approve of" is a term that means to accept, support, or endorse something. However, this term can be substituted with a variety of synonyms depending on the context. Some common synonyms for "approve of" include agreeing with, giving consent to, endorsing, sanctioning and backing. Other synonyms might include favoring, supporting, appreciating, giving the green light to, and giving the nod to. In any given context, it is important to select the right synonym for "approve of" to convey the intended meaning succinctly and clearly. Overall, having a diverse range of synonyms can help writers and speakers to express themselves with precision and clarity.