I am doing a gene enrichment of different clusters obtained by WGCNA, but there are some of them in which I don't get enriched processes, is there any way to find processes to these modules, for example to associate them to orthologues of other organisms. If there are different ways, could you send me links on how to do it?
Well, not all modules will have significant enrichment in gene sets such as GO terms or KEGG pathways. In my experience, the smaller modules are often not significantly enriched. They could be the result of some technical variation, they could contain genes localized to a particular genomic region (do you also calculate enrichment in genomic regions?) or they could be a particular gene family. WGCNA modules often are enriched in known pathways and processes, but that does not mean that all will be.