Which term describes words that have no relation to each other or are considered gibberish?

The term that describes a collection of words that have no logical connection to one another or may seem nonsensical is indeed referred to as "word salad." This term is commonly used in the context of psychiatric conditions, especially in certain types of schizophrenia, where a person may produce speech that lacks coherent meaning.

Word salad reflects a breakdown in the organization of thoughts, leading to a disjointed pattern of speech that can make it difficult for others to understand. It often combines random words and phrases that do not fit together logically or thematically, resulting in a communication style that may resemble gibberish. This behavior is symptomatic of severe thought disorders where cognitive processes are impaired.

Other terms in the options serve different meanings. Neologisms refer to newly coined words or expressions that have a specific meaning to the speaker but may be nonsensical to others. Perseveration involves the repetition of a particular response or behavior despite the cessation of the trigger, while thought-blocking describes a sudden interruption in a person's train of thought, which can lead to silence or an inability to continue a conversation. Each of these terms is related to thought processes but does not define the incoherence characteristic of word salad.