fun getDefinition(word: String) {
        progress.postValue(true)
        urbanUseCaseRx.execute(DefinitionObserver(),word)
    }

inner class DefinitionObserver : DefaultSingleObserver<Result<BaseResponse>>() {
        override fun onSuccess(model: Result<BaseResponse>) {
            super.onSuccess(model)
            progress.postValue(false)

        }

        override fun onError(error: Throwable) {
            super.onError(error)
            progress.postValue(false)
        }

    }