13. A system comprising: one or more processors; one or more memories comprising instructions stored thereon that, responsive to execution by the one or more processors, perform operations comprising: determining, based on a multi-word phrase, a word-dependent language model specific to the multi-word phrase and enabling word-level speech verification, the word-dependent language model including different accuracy thresholds for at least two of the multiple words, the different accuracy thresholds including a highest accuracy threshold for a most important word in the multi word phrase, the highest accuracy threshold generated by providing a greatest number of imposter words in the word-dependent language model for the most important word in the multi-word phrase, wherein determining the word-dependent language model determines, based on a length of the most important word in the multi-word phrase, a set of words having the length, and wherein the imposter words for the most important word in the word-dependent language model includes the set of words; providing the word-dependent language model of the multi-word phrase to a speech-recognition engine; and receiving, from the speech-recognition engine and responsive to the speech recognition engine receiving one or more human utterances associated with the multi-word phrase, an indication that the one or more utterances is verified or not verified to be the multi-word phrase.
15. The system as described in claim 13 , wherein determining the word-dependent language model determines, based on one or more letters and letter locations of multiple words in the multi word phrase that are known to a person from which the one or more human utterances are expected, the different accuracy thresholds for the at least two of the multiple words.