vowel vs vowel point

vowel and vowel point both are nouns.

Word	Noun	Adjective	Verb	Adverb
vowel	Yes	No	No	No
vowel point	Yes	No	No	No

As nouns, vowel point is a hyponym of vowel; that is, vowel point is a word with a more specific, narrower meaning than vowel:

vowel: a letter of the alphabet standing for a spoken vowel
vowel point: a mark placed below or near a consonant (as in Hebrew or Arabic) to indicate the spoken vowel

vowel (noun)	vowel point (noun)
a speech sound made with the vocal tract open	a mark placed below or near a consonant (as in Hebrew or Arabic) to indicate the spoken vowel
a letter of the alphabet standing for a spoken vowel