Have you tried GO annotation?

Try Biofilter . You can annotate the genes for the groups and sources, which will include the gene function. It may help!

I believe there are different GO tools that might end up giving different results. First of all one need to understand that manual gene by gene search is not significant enough to term the GO you have been looking for. That is where we use the enrichment term where you try to see how your gene have been enriched across different GO terms with significance , and these tools all vary with their knowledge base on which they are built. So you can always test with more tools like Amigo2, PANTHER, Enrichr and try to play with the best fit filtering strategy for selecting terms. I always go with FDR unless am focusing on something particular. Since you are focusing on a particular term, there might be different GO terms that converse into cell elongation as well. So trying looking into the output carefully. Looking for a single category might not term it to be significantly up the ladder, since you might have genes that have higher significant enrichment for other category. So you take into account all chores.