The situation you're describing, where James has a limited level of communication compared to other children his age, may refer to a communication disorder or a speech and language delay. If his communication challenges are significant, it might be assessed further as part of a developmental disorder, such as Autism Spectrum Disorder (ASD) or a specific language impairment (SLI).
It's important for a qualified professional, such as a speech-language pathologist, to evaluate James to determine the nature and extent of his communication difficulties and to provide appropriate support or intervention. If you have specific concerns, consulting with a healthcare provider or educational professional would be a good next step.