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Explanation: I'm no expert. This is based on dictionaires
solfear = cantar marcando el compás y pronunciando los nombres de las notas
solmization = the action or practice of sol-faing, the notation of music for singers using these syllables
sol-fa (verb) = sing using the sol-fa syllables
sol-fa (noun) the set of syllables - doh, ray, mi, etc., sung to the respective notes of the major scale; the system of notating music for simgers using these syllables; solmization; a musical scale or exercise thus sung
solfège = solfeggio. Also rudimentary musical instruction, esp. using textless exercises for the voice.
solfeggio = an exercise for the voice using the sol-fa syllables. also solmization
Solmization (also known as sol-fa) is the use of syllables (such as do, re, and mi) to indicate musical notes. You might think it would be named "doremization," but the word dates to slightly before "do" was part of the scale (at least in English). Later, "solfeggio" (and the French form solfège) came to mean applying sol-fa syllables to a scale or tune.