Hi For 'chord' and 'phase' I don't think you can specifically speak of a base word; instead they're more like derivations I think. Chord --> accord --> (Latin) Ad+cord --> 'cord' (here perhaps a suffix + base word) Phase --> (Greek) Phasis (more like the original word but in another form) However, in the case of 'assent': Assent = probably derived from as+sent; to sent, which could be considered as the base. Perhaps this is more the area of etymology, but it's interesting nonetheless.
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