عدم التمييز بين الشيء وشبهه
Not distinguishing a thing from another thing that resembles it.
This general formula guides the next classification. The resemblance may concern words, when identical or similar expressions carry different meanings, or it may concern meaning and reasoning, when propositions appear alike but differ in their truth conditions.
Similarity is not identity. Sharing a name, quality, or grammatical appearance does not establish sameness of referent or consequence.