What is the test for determining whether two words share a morpheme rather than just coincidentally similar sounds?
Think about your answer, then reveal below.
Model answer: The shared form must also carry a shared meaning or grammatical function across both words. Sound similarity alone is not enough — the 'un-' in 'uncle' sounds like the prefix 'un-' (meaning 'not') but contributes no negation meaning, so it is not the same morpheme.
Morphemes are form-meaning pairings. This prevents false segmentation of words like 'uncle', 'carpet', or 'butter', where familiar-looking sequences lack the corresponding meaning. Applying the meaning test consistently is the core skill in morphological analysis.