Using for loop:

GOres = list() # define an empty list to store the for loop output from each interation
for(i in 1:length(DEG)) {
  GOres[[i]] = enrichGO(gene          = DEG[[i]],
                        universe      = allExpressedGene, #provide all genes with expression in your experiment/or skip this
                        OrgDb         = org.Hs.eg.db, # assumed the data is coming from human
                        ont           = "CC", # check other options like MF and BP 
                        pAdjustMethod = "BH",
                        pvalueCutoff  = 0.01,
                        qvalueCutoff  = 0.05,
                        readable      = TRUE)
}