Other popular metrics like METEOR (Denkowski and Lavie, 2014) and TERp (Snover et al., 2008) also use external resources like WordNet and paraphrase databases.
system-level correlation with human judgements for these metrics remains below 0.90 Pearson correlation coefficient (as per WMT-14 results, BLEU-0.888, NIST-0.867, METEOR-0.829, TER-0.826, WER-0.821).