Final answer:
Steve using 'gwobble' and 'senft' instead of the standard terminology represents the use of neologisms, which are made-up words often associated with psychiatric conditions.
Step-by-step explanation:
The signs of thought disorders described in the question, where Steve uses made-up words like "gwobble" and "senft" instead of their actual meanings, are known as neologisms. A neologism is the creation of new words or phrases that may be incomprehensible to others, often associated with certain psychiatric disorders. They are a common symptom of disorganized thinking, which is characterized by difficulties in organizing thoughts and communicating in a coherent manner. In Steve's case, his use of neologisms indicates a disintegration of his thought process and a sign of his deteriorating mental state.
On the other hand, delusions involve false beliefs firmly maintained despite being contradicted by what is generally accepted as reality. Hallucinations refer to perceptions in the absence of external stimuli, and disorganized thinking is a disturbance in the organization and quality of thought.