Possible is an adjective that suggests something is attainable, achievable, or within reach. However, there are many other synonyms that could express similar possibilities. For instance, potential hints at something that could happen but hasn't yet; viable conveys an idea of something that is doable, realistic, and likely accomplishable; plausible means that something appears reasonable, and may be true, accurate or acceptable. Additionally, conceivable evokes a sense of possibility that something can be imagined, assumed, or thought of. In summary, there are many other synonyms with distinct nuances of meaning available that could capture the essence of "possible".