Following a confirmed stroke affecting a specific language area, a patient repeatedly says "the spoon" when trying to name a fork, alongside other clear signs of word-finding difficulty and disturbed grammar, but with no evidence of psychotic thought content. What is this?

This is a paraphasia: a wrong word substituted for the intended one, arising from a disturbance of language processing in aphasia, here with a confirmed neurological cause and accompanying signs of aphasia (word-finding difficulty, disturbed grammar) rather than any psychotic content — exactly the pattern the phenomenon's own text describes. It is not a neologism, which in the psychiatric sense arises from psychotic thought content rather than a language-processing disorder. It is not formal thought disorder more broadly, since the disturbance here is specifically a language-processing error with a clear neurological cause. And it is not verbigeration, which is meaningless repetition of words or phrases, not a specific word-substitution error.