syllable
A beat in a word. Each syllable has one vowel sound. sun-set has 2 syllables.
vowel
The letters a, e, i, o and u (and sometimes y). Every syllable needs a vowel sound.
segment
To break a word into its sounds so you can write a letter or letter team for each one.
compound word
Two small words joined to make one new word, like snow + man = snowman.