The best replacement for articulation is phonology.

The best alternatives to articulation are rated as following:
★★★★★  phonology
★★★★  phonological disorder
★★★★  pronunciation
★★★  phonological disorders
★★  enunciation
★★  matriculation
★  phonological
★  phonological processes
★  joints
  interest aggregation
  apraxia

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Speaking about articulation, one probably shouldn't forget about speech.

Other search terms related to articulation and their ratings are:
★★★★★ speech
★ thoracic vertebrae
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articulation
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