Table 15: Similarity measures.
| Similarity Measures | Type | #used | Papers |
| WordNet | Semantic | 15 | [FS43][FS15][FS34][FS35][FS36][FS44][FS27] [FS21][FS30][FS48][FS14][FS18] [FS55] [FS49] |
| Normalized Google Distance (NGD) | 7 | [FS45][FS3][FS2][FS24][FS41][FS50][FS55] | |
| Ontology | 15 | [FS43][FS15] [FS34] [FS35] [FS27] [FS38] [FS29] [FS5] [FS23] [FS18] [FS31] [FS18] [FS8] [FS49] [FS55] | |
| n ° of Wikipedia | 1 | [FS41] | |
| Cosine Similarity | Syntactic | 10 | [FS7][FS33][FS25][FS20][FS30][FS48][FS13][FS42][FS28][FS21] |
| TFIDF | 16 | [FS43] [FS15] [FS35] [FS27] [FS37] [FS19] [FS39] [FS2] [FS21] [FS48] [FS22] [FS42] [FS13] [FS18] [FS25] [FS49] [FS50] [FS55] | |
| Pearson Correlation Coefficient (PCC) | Distance | 11 | [FS16][FS1][FS17][FS4][FS20][FS10][FS30][FS11][FS22][FS40][FS50] |
| Levenshtein Distance (LD) | 1 | [FS43] | |
| Euclidean Distance | 4 | [FS20][FS28] [FS49] [FS56] | |
| Jaccard Coefficient | 3 | [FS2] [FS51][FS56] | |
| Mahalanobis Distance | 1 | [FS13] |