Context: In addition to the minimal units that can serve the purpose of differentiating meaning (the phonemes), phonology studies how sounds alternate, i.e. replace one another in different forms of the same morpheme (allomorphs), as well as, for example, syllable structure, stress, feature geometry, accent, and intonation.

Question: What do phonemes differentiate? 
Answer: meaning

Question: Aside from phonemes what is studied by phonology?
Answer: how sounds alternate

Question: The study of syllable structure is part of what discipline?
Answer: phonology

Question: What do allomorphs differentiate?
Answer: Unanswerable

Question: Aside from phonemes what is studies by geometry?
Answer: Unanswerable

Question: The study of accent structure is part of what discipline?
Answer: Unanswerable

Question: What studies how geometry alternates?
Answer: Unanswerable

Question: What is another name for syllable?
Answer: Unanswerable