WordNet keyphrase keyphrases encyclopedias wordnets homonymous polysemous wordnet meronymy hypernymy hyponymy meronym synsets synset hyponym hypernym polysemes homonymy fasttext Word2Vec pointwise softmax word2vec LSTM siamese numberbatch fastText FastText Multifactor Multifactor pseudorandom plaintext ciphertext malware spyware rootkit Slowloris honeypot honeypots inline stateful unsecure replaceability Kerberos IoT Blockchain blockchain cryptocurrency Bitcoin permissioned UAV permissionless blockchains cyberattacks FMS GPS